The computer boot enough mouse keyboard screen does not have any response, with the state of the shutdown one, and the chassis inside the fan are rotating, the lights on the motherboard is also bright
A black screen after the boot, the host and the monitor's lights are not bright, or the monitor's lights and the host's lights do not light. This type of failure should first check the host power supply and power switch is good or bad and its connection is normal or not, especially the power cord and power socket is connected to normal and intact. If there is a problem with the power supply, after turning on the computer can be seen in the host chassis panel lights do not light up, and can not hear the host of the power supply fan rotating sound and hard disk self-test sound and so on, indicating that your host system does not get a normal power supply - this type of problem should first check whether the external AC power problems. With a stylus to see whether the power socket and power cord connected to the host side of the power supply, if necessary, use a multimeter to detect whether the voltage is normal, the voltage is too high or too low may cause the host power supply over-voltage or under-voltage circuit of the automatic shutdown protection. If all of the above are not a problem, then you should first focus on the maintenance of the host internal and power switch and reset button, you can use the minimum system method and replacement method, one by one to unplug the host within the plug-in card and other equipment power lines, signal lines, and then power on the test machine. Such as unplugging a device when the host power back to work, it is just unplugged device damage or improper installation resulting in a short circuit, so that the power supply in the short-circuit protection circuit is activated, stopping the power supply to the equipment in the machine, then you can focus on checking its contact, and if necessary, replace it. In addition, focus on checking the quality of the power switch and reset button, they are connected to the motherboard with the correct or not is also very important, because many low-quality chassis on the power switch and reset button often occurs after a few times after the use of its internal metal contact piece fracture and the occurrence of a short-circuit of the power supply, resulting in the entire machine black screen without any display. If the above checks have not solved the problem, then please replace the power supply or dismantle the power supply, focus on checking whether the fuse or components are fused or damaged.
In addition, the host's motherboard, CPU, CPU fan and graphics card and other accessories are damaged can also cause the host does not light the black screen failure. At the same time in the maintenance should also focus on checking the motherboard on the various power connection line signal is connected correctly or loose.
2. The host can be self-test
Black screen after the boot, the indicator is bright, the host switching power supply is also normal rotation, but can not hear the sound of the hard disk self-test, but you can hear the speaker's chirp; or boot the screen display, you can hear the sound of the machine self-test, but the screen is frozen in the self-test of a
Steps, and occasionally there are also error prompts; or randomly does not show the dynamic The black screen malfunction, sometimes can display or normal startup, and sometimes black screen malfunction.
(1) Listen to the sound to identify the fault
For the common boot black screen failure we can identify the host startup speaker alarm sound to identify.
Award BIOS motherboard failure warning table
1 Short: The system boots up normally.
1 long1 short:Memory or motherboard error.
1 long 2 short:Monitor or graphics card error.
1 long 3 short:Keyboard controller error.
1 long 9 short:Motherboard BIOS corruption.
Continuous ringing (with intermittent long sounds):Memory stick not inserted tightly or damaged.
Constant ringing:Power supply, monitor not connected to graphics card. Check all the connectors.
Repeated short beeps:Power supply problem.
AMI BIOS Warning Table for Motherboard Failures
1 Short:Memory refresh failure.
3Short:System base memory (1st 64KB) check failed, need to change memory.
4 short:System clock error.
5Short:Central processing unit (CPU) error.
6 short:Keyboard controller error.
7 short:System real mode error, can not switch to protection mode.
8 Short:Display memory error.
9 Short:BIOS check error.
1 long 3 short:Memory error.
1 long 8 short:Display test error, monitor cable not plugged in or video card not plugged in securely.
The need for special instructions is that, in practice, many users have found that the most commonly encountered such black screen failure is mostly due to the memory stick is not inserted tightly or damaged, and the intermittent horn alarm sound, we can focus on checking the memory stick is not loose or have
dust into the memory stick can be removed from the memory slot or memory clean, or a memory slot, or a change in memory! Try it.
(2) Check the quality of installation of accessories
The occurrence of such black screen failure, you should also first check the quality of installation of accessories. For example, whether the memory stick is installed correctly, whether it is tight with the motherboard slot, whether the graphics card and other plug-in cards are installed in place, as well as their related settings in the BIOS, on the motherboard jumper selection is correct, you can carefully refer to the relevant board instructions to set up. It is recommended to use the factory settings of the BIOS for general users. Sometimes the memory category settings do not match the actual, the memory access speed is set too fast, if the user's memory performance can not meet the requirements and forced to set, then it is prone to crashes, and the mix of different brands of memory and Cache setting errors can cause crashes and black screen. In addition, the focus on checking the quality of the board itself and the motherboard related slots and cards on the "gold finger" part of the foreign matter.
Additionally, you need to consider whether the CPU is overclocked, or whether the hard drive or CD-ROM cable is reversed. In addition, when you add some new equipment, the monitor will appear black screen failure, exclude the quality of accessories and compatibility issues, the power supply quality is not good, insufficient power may be the main cause of failure, replacement of high-power quality power supply is the best solution for this kind of failure. Now this kind of power supply insufficient power caused by the system black screen is very common.
(3) other
Computer parts of poor quality or damage, is the main cause of monitor black screen failure. For example, the motherboard (and motherboard BIOS), memory, hard disk, graphics card and other problems are very likely to cause a black screen failure. Failure performance such as the display lights are orange, etc., then replace the graphics card, memory, motherboard, CPU replacement method to try, is the fastest solution. Others, such as the motherboard CMOS settings are not correct, the motherboard to clear the BIOS jumper is not correct, etc. can cause a black screen failure, then you can change its settings against the motherboard manual. In addition, software conflicts such as faulty or improperly installed drivers, BIOS
refresh errors, incorrect power management settings, and hardware damage caused by malignant viruses (CIH) can cause such black screen failures. In addition, your accessories and operating system or driver or system software is not compatible can also cause boot into the Windows self-test screen when the black screen of death failure, these need to do careful understanding.
Failure examples
A MVP4 motherboard, K6-2 300 CPU, 128M RAM, CoolFish II 30G hard disk, optical drive, floppy drive compatibility, no overclocking use, the random startup black screen failure, the failure is sometimes boot up the normal self-test can be normal use, but often boot up the black screen failure.
Analysis and solution: I took over the machine, after the boot performance for the black screen, but there is a memory error continuous chirping, suspected that the memory is loose, open the chassis, see the machine on the two memory slots inserted two 64M HY memory, the memory will be removed and cleaned up, re-installed after the boot fault disappeared, then re-installed the computer and then start, but then there was a black screen with no alarm sound. Then open the chassis, first remove a memory, and then another memory repeatedly pressed the plug tight, and several times in a row to turn on the power supply, the computer are normal, then close the chassis after the installation of the computer, the use of all normal. But the next day the user called again, said the computer black screen again. So the computer was moved to my place to carefully observe, and again reinstalled memory and replaced with new memory, the strange thing is that the computer actually no longer alarm sound and boot self-test sound. First with the minimum system method to dismantle the hard disk, CD-ROM drive, sound card, etc., leaving only the motherboard, CPU, memory, graphics card, the minimum system, still black screen, then use the replacement method to try one by one, the machine parts are all normal, they are re-installed in the machine outside of the minimum system to power on the computer again, the computer is back to normal. First ruled out a short circuit in the machine, focusing on suspected memory slot problems and CMOS battery voltage is insufficient, in line with the principle of easy to repair, remove the CMOS battery with a multimeter to try to 3.03v or so, to bring a new CMOS battery to try to 3.35v or so, the old battery power is slightly less than the replacement, then replaced, the replacement of a good machine, do not go on the hard disk continuous on/off switching, and no longer have Random black screen failure occurs. Thought everything was fine, the next day the user to get a computer, boot try the host fan are running normally, but no alarm sound, self-test sound, the display again black screen and no screen display, and several times to install and disassemble the machine can not solve the problem, think it's very strange, and then suspected that the computer motherboard or the motherboard and the components of poor contact between the components, or components soldering, focusing on the inspection of the motherboard, remove the motherboard to carefully observe its components and no obvious signs of loosening, observed with a magnifying glass, the motherboard is not a good idea. Signs of loosening, with a magnifying glass to observe the bottom plate soldering points, found that the CMOS chip socket has signs of soldering, take the iron for its one by one to make up for the welding (special attention, the general user should not do it yourself to make up for the welding, unless you have a very high welding technology, such as really can not find the power supply of the motherboard and the big components can be tried to the main board and the suspected soldering points to make up for the welding), the fault is completely eliminated. This example of failure for the obvious components of the welding quality caused by the failure of the average user can best buy the use of "motherboard diagnostic card" and other detection tools for such hard failure to determine the approximate location, more able to do targeted.
Black screen failure 10 cases
The following are common faults in the maintenance of my humble self, with **** sex, if some help to the users, I will be honored.
1 On the display black screen, only the indicator light, the host did not reflect any. The hand stretched behind the host can not feel the fan in the turn. Measure the voltage of each circuit are not. Remove the found that the power supply regulator tube bad, replace the normal.
2 Long sound alarm at boot, should be memory failure. Unplug the memory, clear the gold finger, insert normal.
3 Power on and CPU fan are normal, but the screen does not reflect anything, and no self-test sound. This machine adopts SLOT1 structure, the CPU is easy to contact poor, reinstall normal.
4 Self-test on normal, but the screen does not light up. According to the owner of the machine, pulled the back of the display signal line. Unplugged a look, a pin was bent.
5 The screen does not light up. The machine does not self-test. With a meter pin shorted to the boot terminal on the motherboard, normal startup. It turns out that the panel start switch is broken.
6 boot not self-test, check the power supply is normal. Minimum system method, when removing the CD-ROM drive, the machine can start normally. And then put on the fault reappeared. Explain that the optical drive problems caused by the machine can not start. This case should cause peer attention.
7 boot does not start, according to the owner said, he moved the BIOS, want to overclock the CPU through the soft jumper, resulting in the emergence of this fault. Open the machine, to the motherboard discharge (motherboard has two pins for clear BIOS settings) after normal. It turns out that too much overclocking leads to CPU strikes.
8 Trouble with 7, the owner of the machine into the BIOS, the machine is set to "optimized settings", resulting in a black screen. The same treatment as above.
9 Turn on the self-test sound, but the screen does not light. Use the test card to detect the host is not faulty. Open the monitor to see the host over the signal line on the monitor board to be soldered. Resoldering normal.
10 Same as above. Monitor switching power supply output is lower than normal, check the power switch IC bad.
I think that in addition to the last two cases, computer enthusiasts can try their hands, and slowly you will become an expert.
About the black screen on my solution
I bought this machine two long weeks ago.
Symptoms: Power light on. The screen does not light up. No response. Long press the power switch. Restart. Normal startup. That means it must start twice.
The following is a netizen's solution:
Don't let the touchpad be in a locked state before shutting down the computer (actually, there is no need to lock the touchpad, in my opinion). The touchpad is in a locked state shutdown, and then turn on the computer, will be black The touchpad is not in a locked state shutdown, and then turn on the computer, will not be black, even if the black screen, do not be afraid, just press fn + f7, and then turn on the computer. It's not a flaw at all, it's just the way it's designed to keep the touchpad locked when you turn it on. People need to keep their wits about them sometimes and separate the good gun text.
If you have an external keyboard, then there's no need to shrink the touchpad and it won't go black. That's why some people didn't black out. Black screen don't be in a hurry, what unplugging power ah, remove the battery ah, tired ah, before doing things do not think about the cause of things, turn on the machine twice on the line. Because the second time you turn on the machine is to unlock the first time.
As long as the computer in the process of a boot into sleep, and then boot time is bound to black
Battery mode as soon as the cover is closed on the sleep, note, not hibernation
The solution is to press Fn + F5 or F7 can be turned on.
I think the above makes sense. As for my personal experiment that solved my problem. It is to make sure that the touchpad is not locked before shutting down the computer so that the next time you start it up, it works fine. The next startup will be normal. As for the (don't be afraid to press fn+f7 even if the screen is black and it will turn on) method, I tried it and it didn't work.
I hope this will help those of you who have had problems like mine.
There are a number of ways in which you can improve your PC's performance, including the use of a newer, more powerful, and more efficient power supply. However, some common motherboard failure does not require specialized testing equipment, you can do it yourself to solve the following are some of the most typical motherboard failure repair examples, I hope you can learn from the basic approach to solve the motherboard failure.
First, boot without display class failure
Example 1: motherboard does not start, boot without display, there is a memory alarm sound (tick tock called endlessly)
Fault cause: memory alarm failure is more common, mainly caused by poor memory contact. For example, the memory stick is not standardized, the memory stick is a bit thin, when the memory inserted into the memory slot, leaving a certain gap; memory stick gold finger process is poor, the surface of the gold finger gold plating is poor, a long time, the gold finger surface oxidation layer gradually thickened, resulting in poor memory contact; memory slot quality is poor, the reed and memory stick gold finger contact is not real and so on.
Treatment: Open the chassis, carefully wipe the gold fingers of the memory stick with rubber, take down the memory stick and re-insert it, fill in the gaps on both sides of the memory slot with hot melt glue, and prevent it from continuing to oxidize during use. Note: Be sure to unplug the host folding power cord when unplugging the memory stick to prevent accidental memory burns.
Example 2: The motherboard does not start, boot no display, there is a graphics card alarm sound (a long two short chirping)
Reason for the failure: generally loose graphics card or graphics card damage.
Treatment: Open the chassis, the graphics card can be re-inserted. To check whether there are small foreign objects in the AGP slot, otherwise the graphics card can not be inserted into place; for the use of voice alarm motherboards, you should carefully identify the content of the voice prompts, and then according to the content of the corresponding fault resolution.
If the above approach to deal with the alarm, it is possible that the graphics chip is bad, replace or repair the graphics card. If you hear a beep after booting through the self-test, the display is normal but no image, the graphics card is inserted in other motherboards, the use of normal, that is, the graphics card is incompatible with the motherboard, you should replace the graphics card.
Example 3: The motherboard does not start, no display on the boot, no alarm sound
Reason for failure: There are many reasons, mainly the following.
Treatment: For the following reasons, one by one to eliminate. Requires you to be familiar with digital circuits analog circuits, will use the multimeter, and sometimes need to check the fault with the help of DEBUG card.
(1) CPU problems
CPU is not powered: the multimeter can be used to test the CPU around the three (or one) field tube and three (or one) rectifier diode, check whether the CPU is damaged.
CPU socket with missing pins or loose: this type of failure is manifested in the point does not light or irregular dead. Need to open the top cover of the CPU socket surface, carefully with the eyes to see if there is a deformation of the pins.
CPU socket fan fixed card broken: consider using other fixed methods, generally do not replace the CPU socket, because manual welding is prone to leave hidden faults.SOCKET370 CPU, the radiator is fixed through the CPU socket, if the fixed spring sheet is too tight, the disassembly will have to be careful and cautious, otherwise it will cause the plastic card broken, there is no way to The CPU fan is secured.
The CPU frequency set in CMOS is not correct: just clear the CMOS to solve the problem. Clear CMOS jumper is generally near the motherboard's lithium battery, its default position is generally 1, 2 short-circuit, as long as the jump to 2, 3 short-circuit for a few seconds to solve the problem, for the old motherboard, such as finding the jumper, as long as the battery is removed, to be turned on to enter the CMOS settings and then shut down the power, the battery will be installed on the battery can be discharged to the CMOS.
(2) The motherboard expansion slot or expansion card has a problem
Because the motherboard expansion slot or expansion card has a problem, resulting in the insertion of graphics cards, sound cards, and other expansion cards, the motherboard does not respond, resulting in the boot no display. For example, brute force disassembly of AGP graphics cards, resulting in cracked AGP slots, can cause such failures.
(3) Memory problems
The motherboard can not recognize the memory, memory damage or memory mismatch: some of the older motherboards are more picky about the memory, once plugged into the motherboard can not recognize the memory, the motherboard can not start, and even some motherboards do not have a failure to indicate (chirp). In addition, if you plug in a different brand, type of memory, sometimes also lead to such failures.
Memory slot broken pins or burning: Sometimes because of too much force or improper installation methods, the reeds in the memory slot will be deformed and broken, so that the memory slot is scrapped. Note: When inserting or removing a memory stick, use vertical force and don't shake it from side to side. Before unplugging the memory stick, be sure to unplug the power supply of the host computer to prevent the memory from being charged when using the STR function and burning the memory stick. In addition, the memory should not be installed backwards, so as not to burn the memory stick after powering up. But now the motherboard, generally have anti-dull design, will not be inserted in reverse.
(4) The motherboard BIOS is damaged
The motherboard BIOS stores important hardware data, while the BIOS is also the more vulnerable part of the motherboard, extremely susceptible to damage, once the damage will lead to the system can not run.
These failures are generally due to the fact that the motherboard's BIOS is damaged by the CIH virus. Generally BIOS is damaged by the virus, the hard disk data will be all lost, you can test the hard disk data is intact, in order to determine whether the BIOS is destroyed; in the DEBUG card, you can also through the card on the BIOS indicator is bright to judge. When the BOOT block of the BIOS is not destroyed, the monitor does not light up after startup, and the PC speaker has a beeping alarm; if the BOOT is destroyed, then after powering up, the power supply and hard disk lights are on, and the CPU fan rotates, but it does not start up, and at this time, you can only rewrite the BIOS through the programmer.
You can also plug in the ISA graphics card to see if it is on display (if there is a hint, you can follow the prompt If you do, just follow the steps.)
Advanced Mode
Advanced mode provides a more comprehensive set of features and functionality to maximize the visual quality of your PC's audiovisual experience.
(5) The battery used for CMOS is faulty
When the power switch is pressed, the hard disk and power lights are on, the CPU fan turns, but the host does not start. When the battery is removed, it can start normally.
(6) Motherboard auto-protection lock
Some motherboards have auto-detection protection, when the power supply voltage is abnormal, or CPU overclocking, adjusting the voltage is too high when the situation occurs, it will be automatically locked to stop working. This is the first time I've ever seen a motherboard with a full HDD, and I've never seen a motherboard with a full HDD, so I'm not sure if I'm going to be able to get the same HDD as the one I'm using.
(7) motherboard capacitor damage
Check whether the motherboard capacitor bubbling or cracked. When the capacitor due to high voltage or long time by the high temperature baking, will bubble or drip liquid, then the capacitance of the capacitor capacity reduction or loss of capacitance, capacitance will lose the function of filtering, so that the provision of load current in the AC component increased, resulting in the CPU, memory, the relevant board card work is not stable, the performance is easy to crash or system instability, often appear blue screen.
Example 4: Motherboard temperature control failure, resulting in boot without display
The ASUS P3B-F motherboard can monitor the CPU temperature with a 2Pin temperature monitoring cable, inserted in the JTP pin next to the CPU slot. Later, during a game, the machine suddenly blue screen, reboot, wait until the CD-ROM drive, hard disk self-test is completed after the monitor actually does not light up.
The reason for the failure: the temperature control cable connected to the motherboard fell off, fell on the motherboard, resulting in the motherboard automatically enter the protection state, refused to power. As the CPU heat is now very large, so many motherboards provide strict temperature monitoring and protection devices. Generally the CPU temperature is too high, or the temperature monitoring system on the motherboard fails, the motherboard will automatically enter the protection state. Refuse to power up the boot, or alarm prompts.
Treatment: Reconnect the temperature monitoring cable and power on again. Note that when your motherboard fails to boot normally or alarms, you should first check if the temperature monitoring device on the motherboard is normal.
Computer can not boot, black screen troubleshooting
Many times we will encounter after pressing the computer POWER key, the computer can not start, without any boot self-test or enter the operating system phenomenon, often making the user can not handle and affect the normal use. Here we do a simple analysis of the common failure phenomena, analysis and solutions, I hope to encounter such problems of the user to help.
Press the POWER key without any reflection
Phenomenon: no display on the screen after the boot, do not hear the motherboard speaker "drop" sound.
Failure analysis: motherboard COMS chip internal BIOS data was damaged by CIH virus or electrostatic problems such as damage damage, can not be read, the system startup can not complete the self-test, so can not start.
Known solutions: Contact the motherboard manufacturer to replace the new COMS chip or find the BIOS file provided by the motherboard manufacturer to write using a burner.
Trouble phenomenon: after pressing the POWER key, the CD-ROM drive light flashes, the motherboard power LED is on, the power supply is normal, but the screen does not display, no "drop" sound.
Failure analysis: CUP damage will occur after this phenomenon, BIOS in the self-test process first check the CPU, CPU damage can not pass the self-test, the computer can not start.
Known solutions: check whether the CPU is installed correctly, check whether the CPU core is damaged, use the replacement method to check whether the CPU is damaged, if the CPU is damaged, replace the CPU.
Failure phenomenon: boot without any display, there is no prompt, the motherboard power supply is normal, the CUP is normal, the fan is normal, but the screen does not show. There is also no self-test through the "drop" sound.
Fault analysis: computer in the use of more than 3 years, the BIOS settings for the power supply battery voltage is gradually reduced, can not save the data, in some of the use of early chipset motherboards will not be able to complete the self-test of the phenomenon, the motherboard itself is not a problem of hardware.
Known solutions: buy a CR2032 lithium battery, replace the existing battery on the motherboard can normally complete the self-test, and then reset the BIOS parameters.
Failure phenomenon: press the POWER key, the computer immediately shut down automatically or no response.
Failure Analysis: Some motherboard manufacturers in order to protect the CPU from heat sinks, resulting in the occurrence of CPU burn, in the absence of the installation of the CPU fan or not with the motherboard CFAN interface to connect the CPU fan power cord, or will be the CPU fan connected to the SFAN (the interface of the system fan) will not be able to power on the computer.
KNOWN SOLUTION: Correctly connect the CPU fan to the motherboard's power connector and make sure that it is connected to the three-pronged dedicated CPU fan connector on the CFAN next to the CPU.
Fault phenomenon: after pressing the POWER key, the self-test can not be passed, the monitor does not display, the monitor indicator is orange or flashing state.
Fault analysis: self-test process, the graphics card did not pass the self-test, can not complete the detection of basic hardware, can not start.
Known solutions: check whether the graphics card gold finger is oxidized or AGP interface in a large amount of dust resulting in a short circuit, gently rub the gold finger with an eraser, and use a leather tiger to clean up the dust in the AGP interface. At the same time, use the replacement method to rule out the problem of graphics card damage, if the graphics card is damaged, replace the graphics card can be.
Trouble phenomenon: after the boot did not complete the self-test, did not hear a "drop" sound, while issuing a continuous "drop - drop - drop ..." The sound of a continuous "drip-drip-drip..." is also heard.
Failure analysis: According to the BIOS alarm tone provided by the BIOS manufacturer, the problem is usually in the memory, the chance of memory damage is relatively small, most of the problems are caused by memory oxidation or poor contact with the slot.
Known solutions: first check the gold fingers, memory slots, chips and PCB for signs of burns, if there is a recommendation to replace the memory. If not, use an eraser to gently rub the gold fingers and then reinsert the memory slot.
Fault phenomenon: After powering on the computer, the power supply is normal, but the keyboard NUM and other indicators do not flash. Can not complete the self-test.
Fault analysis: the motherboard's keyboard controller or I/O chip is damaged, can not complete the self-test.
Known solutions: through the manufacturer to replace the I / O chip, and check the keyboard interface circuit.
Fault phenomenon: press the POWER key does not respond, the power and hard disk indicator also does not light.
Fault analysis: through the use of multimeter on the power supply output voltage checks, found that 12V 5V 3.3V are abnormal, and the standard voltage gap is very large, the power supply internal circuit problems.
Known solutions: replace the high-quality 300W power supply, the problem is solved.
Trouble phenomenon: the chassis components removed, do test normal, when installed into the chassis can not boot, sometimes the chassis can be normal boot up, flat can not boot.
Failure analysis: some chassis production is not standard, resulting in the installation of some motherboard deformation or deformation of some boards and cards, the bottom of the motherboard in contact with the chassis, resulting in short-circuit, resulting in the failure to boot.
Known solutions: Replacement of good quality chassis, the use of standard accessories to install the components.
Fault phenomenon: After turning on the power or pressing the POWER button, the power light flashes rapidly. The screen has no display.
Fault Analysis: Sometimes the POWER and RESET of some poor quality chassis tend to get stuck inside or short-circuited internally, resulting in the keys always being connected, repeating the state of power on or restart, causing the illusion of not being able to power on the computer.
Known solutions: replace the damaged keys, or use certain lubricants to lubricate the keys to reduce friction