The computer screen does not automatically go black, that is, the computer does not sleep.
First click the power icon in the lower right corner of the computer, and then click more power options.
Click Change Plan Settings in the pop-up window.
Select the time to enter automatic sleep in putting the computer to sleep. If you want to use it for a long time, you can choose Never, and then click Save to modify it. (You can set different times when using the battery and turning on the power. ) Click "Select the function of closing the lid" and select "Do nothing" in "Closing the lid". So you can do it later.
Computer standby means that the computer is in the middle state of energy saving and system dependence. When the cpu on the computer is idle and not set to run in the specified actual time, it will automatically enter the standby state. Here I will take win7 system as an example. Then the specific operation steps of setting the time are as follows:
Step 1: Click the start menu of the taskbar, find the "Control Panel" option, then open the control panel and find the "Power Options" button in the control panel.
Step 2: Double-click "Power Options" to open the setting window of power options, and then click to select "Change the sleep time of the computer" option.
Step 3: Finally, set the time of "turning off the monitor" and the specific time of "putting the computer to sleep" on the settings of the change plan. The time set here is set by the user at will. After setting, click "Save Changes" to complete the operation of setting computer standby time.
2. The computer screen is black. Is it a system or a black screen? What should I do? Let's have a look.
1. If the host is not on, the screen will be black after booting, and the indicator lights of the host and monitor will not be on, or the indicator lights of the monitor will be on and the indicator lights of the host will not be on.
This kind of fault should first check whether the host power supply and power switch are good or bad and whether the connection is normal, especially whether the power cord and power socket are connected normally and intact. If there is something wrong with the power supply, after turning on the computer, you can see that the indicator light on the main chassis panel is not lit, and you can't hear the rotation sound of the power supply fan and the self-check sound of the hard disk in the host, which means that your host system is not supplying power normally at all-you should check whether there is any communication problem outside first.
Use a test pencil to see if there is electricity on the side where the power socket and power cord are connected to the host power supply. If necessary, use a multimeter to check whether the voltage is normal. Too high or too low voltage may lead to automatic shutdown protection of host power supply. If all the above are all right, then you should first focus on maintaining the host, power switch and reset key. The minimum system method and replacement method can be used to unplug the power line and signal line of the host card and other equipment one by one, and then start the trial operation.
If the power supply of the host computer resumes working when a certain device is unplugged, it is that the newly unplugged device is damaged or improperly installed, resulting in a short circuit, which starts the short circuit protection circuit in the power supply and stops supplying power to the equipment in the machine. Then you can focus on checking its contacts and replace them if necessary. In addition, it is very important to check the quality of the power switch and reset key, and it is also very important to check whether they are connected with the motherboard correctly, because the power switch and reset key on many inferior chassis often disconnect the internal metal contacts after being used several times, resulting in a short circuit of the power supply, resulting in a black screen and no display.
If the above inspection fails to solve the problem, please replace or remove the power supply, and focus on checking whether the fuse or component is blown or damaged. In addition, the motherboard, CPU, CPU fan and graphics card of the host are damaged, which will also lead to the failure of the host's black screen.
At the same time, during maintenance, it is also important to check whether the signals of various power cables on the motherboard are connected correctly or loosely. 2. After the host machine is turned on, it can self-check the black screen, the indicator light is on, and the switching power supply of the host machine also rotates normally, but it can't hear the hard disk self-check, but it can hear the horn; Or there is a screen display when the machine is turned on, and the sound of machine self-check can be heard, but at a certain step of self-check, the screen is frozen, and occasionally there will be an error prompt; Or if there is a dynamic black screen fault, it is not displayed randomly, sometimes it can be displayed normally or started, and sometimes it is black.
(1) Listen to the sound to identify the fault. We can identify common black screen faults by identifying the alarm sound of the speaker when the host computer starts. Main board fault alarm table of Award BIOS 1 Short: the system started normally.
1 long, 1 short: memory or motherboard error. 1 long 2 short: monitor or graphics card error.
1 Length 3 is short: keyboard controller error. 1 long 9 short: the motherboard BIOS is damaged.
Constantly ringing (with intermittent long sound): the memory card is not tightly inserted or damaged. Non-stop ringing: the power supply and monitor are not connected to the graphics card.
Check all connectors. Repeat short ring: there is something wrong with the power supply.
The main board fault alarm table of AMI BIOS 1 is very short: memory refresh failed. 3 Short: The system basic memory (1 64KB) failed to be checked, and the memory needs to be replaced.
4 Short: System clock error. 5 Short: Central Processing Unit (CPU) error.
6 Short: Keyboard controller error. 7 Short: System real mode error, unable to switch to protection mode.
8 Short: Memory error is displayed. 9 short: BIOS check error.
1 Multi-space: Memory error. 1 length 8 short: display test error, indicating that the data cable is not plugged in properly or the graphics card is not plugged in firmly.
In particular, in practice, it is found that the black screen failure encountered by many users is mostly due to intermittent horn alarm caused by loose or damaged memory chips. You can focus on checking whether the memory stick is loose or dust enters. You can remove the memory stick to clean the memory stick or memory, or try plugging in the memory stick or changing the root memory. (2) Check the installation quality of accessories. In case of this black screen failure, you should also check the installation quality of the accessories first.
For example, whether the memory module is installed correctly, whether it is tightly inserted into the motherboard slot, whether the cards such as the graphics card are installed in place, and their related settings in the BIOS, and whether the jumper selection on the motherboard is correct, please carefully refer to the instructions of the relevant boards for setting. It is recommended that ordinary users use the factory settings of BIOS.
Sometimes the category setting of memory does not match the reality, and the access speed of memory is set too fast. If the user's memory performance can't meet the requirements, it is easy to crash if it is forced to set it. Different brands of memory are mixed and cache settings are wrong, which will lead to a black screen. In addition, the quality of check card itself and whether there are foreign objects in the relevant slots on the motherboard and the "golden finger" on the card are also very important.
In addition, whether the CPU is overclocked or not, and whether the data cable of the hard disk or CD-ROM drive is connected reversely all need your consideration. In addition, when you add some new devices, the display will have a black screen failure. After eliminating the quality and compatibility problems of accessories, poor power quality and insufficient power may be the main reasons for the failure, and replacing the high-power and high-quality power supply is the best solution to this kind of failure.
At present, the system black screen caused by insufficient power supply is very common. (3) The poor quality or damage of other computer accessories is the main reason for the failure of the black screen of the monitor.
For example, the motherboard (and the motherboard BIOS), memory, hard disk, graphics card and other issues. It may lead to a black screen failure. Its fault performance is orange, etc. At this time, replacing the lower graphics card, memory, motherboard and CPU with replacement method is the fastest solution.
Others, such as incorrect CMOS setting of the motherboard and incorrect BIOS jumper clearing of the motherboard, may lead to black screen failure. At this time, you can change its settings according to the motherboard manual. In addition, software conflicts such as driver problems or improper installation, BIOS refresh errors, incorrect power management settings, and hardware damage caused by malignant viruses (CIH) may all lead to such black screen failures.
In addition, your accessories are not compatible with the operating system or drivers or system software, which will also lead to the crash and black screen failure when booting into the Windows self-test screen, which needs to be carefully understood. Fault examples: MVP4 motherboard, K6-2 300 CPU, 128M memory, Cool Fish II 30G hard disk, machine compatible with CD-ROM and floppy drive, no overclocking.
3. What should I do if the computer black screen needs to be set?
First, at present, there are two main reasons for computer black screen, one is hardware failure, and the other is software conflict. The difference between them mainly lies in the location where the black screen occurs, that is, when the computer is turned on or during normal use.
Second, both hardware failures and software problems, in a sense, are not isolated. Try to solve it according to the following ideas. I believe that the black screen will be properly solved soon. 1, when a "black screen" suddenly appears after the computer is turned on, please listen to the PC speaker in the computer first to see if there is an alarm sound.
If the PC horn sounds an alarm, the hardware components that may have problems can be preliminarily judged according to the length of the sound. 2. If the alarm sound of the PC speaker is one long and four short when the computer is turned on, it is easy to judge that the problem is on the graphics card according to this prompt.
If so, you can open the chassis to see if your graphics card is safely inserted. If it feels a little loose, please re-insert and tighten the video card, and then fix it with screws.
If the problem of insertion mode is eliminated and the card slot is relatively firm, you can try changing the graphics card to another slot on the motherboard. If the user's graphics card does not belong to PCI but is a new AGP slot board, and there is only one AGP slot on the computer motherboard, you can try another AGP slot on the motherboard to eliminate the physical failure of the graphics card.
If the graphics card is inserted tightly and the physical fault is eliminated, then there is another possibility that the "golden finger" of the graphics card itself has a problem in normal contact. If this is the case, you can pull out the display card again, and then find a clean rubber to rub it back and forth on the "golden finger", because most of the poor contact problems of this "golden finger" are caused by some dirty things on it.
3. If the alarm sound of the PC speaker is not long and short when the computer is turned on, but a short and urgent call, and there is a black screen, then it can be roughly judged that there is a contact problem in the computer memory according to the phenomenon. The solution to poor contact is basically the same as the display card, that is, insert * * * and then insert it. Be sure to insert it to the end when inserting it, and fasten the clips on both sides of the memory module.
SDRAM slots on some motherboards are troublesome, because most of the slots on these motherboards are very tight. If the user encounters this situation, he must not use force. They can press the bottom of SDRAM slot on the motherboard with their fingers, and then press the memory with their thumbs. Hearing a slight noise proves that the memory has bottomed out. Finally, they can fix their memories with clips. 4. There are some black screens in which the computer will not give an alarm. At this time, the simplest thing is to analyze the specific problems according to the mathematical "exclusion method".
First, check whether there is any problem with the power terminal board, remove the relevant supporting parts of the computer and replace them with some other equipment that can be used to check whether the power terminal board works normally. If there is nothing wrong with the power terminal board, then check whether the connection between the computer power supply and the motherboard is normal according to the normal procedure, that is to say, check whether the motherboard power supply is normal.
If the socket is not connected by mistake, check whether the power supply is burnt out. If the power supply burns out, the power supply fan will also stop running. In some early computer cases, the power supply was often insufficient. If this problem is suspected, please unplug all power cords from the hard disk, CD-ROM drive and floppy drive, and then restart the computer. After the power consumption rate is greatly reduced, see if this situation is solved.
5. If the problem still cannot be solved, please rule out that the motherboard BIOS is accidentally damaged by viruses such as CIH, and whether the motherboard is in poor contact or the welding head is short-circuited. In addition to the above, with the continuous improvement of CPU frequency speed, power supply plays an increasingly important role in the whole PC power supply system.
Some people describe the central processing unit as the heart of a computer. They may be too concerned about whether the heart is healthy and strong for a long time, but ignore the chassis power supply that can provide power and energy for the heart. However, due to the lack of power supply, it may also cause the computer to have a black screen.
The symptom is that you can hear the chassis power fan start normally after starting, but you can't hear the "drip" sound of system error, but the machine doesn't work, there is no self-test process, and a black screen is displayed. 6. If all boards and memories are plugged and unplugged again after cutting off the power supply, make sure that all boards or components are not loose, which is mostly caused by insufficient power supply.
Don't neglect the chassis and power supply when buying a computer. Buying a power supply with a rated power of more than 250 watts is a kind of care for the machine. 7. If there are many peripherals installed on the computer, such as dual disks, dual CPUs, dual optical drives, SCSI cards, etc., it is best to find a more powerful (300~400 watts) or server power supply.
As for users of P4, Thunderbird and GeForce3, they must use more than 300 watts of power, otherwise things more troublesome than black screens will emerge one after another. 8. The phenomenon of black screen is mostly caused by a hard injury on the PC, but it is not absolutely so. Soft injuries may sometimes be easier to deceive users.
In the process of using the computer, after entering WINDOWS 98/WINME/WIN2000 or even WINXP system, some black screen phenomena may also be soft faults. 9. The most obvious problem here is the program failure caused by the hardware driver problem.
This kind of problem frequently appears on some third-party boards such as 3D accelerated graphics card, PCI sound card, network card, SCSI card and RAID card, and the most obvious manifestation of this kind of problem is that applications and game software frequently crash during operation, resulting in black screen. This paper analyzes the reasons for this problem, mainly because the power of standard 3D acceleration chips or higher-end, newer non-mainstream 3D acceleration chips is ignored when writing the game source program, so the hardware support of the game itself is not satisfactory, which also affects the performance of the product.
Another example is PCI sound card, PCI network card and so on. Because of the conflict between driver and system application, the machine suddenly appears black screen or restarts. Readers can solve this problem by installing updated drivers.
4. What if the computer becomes a black screen on the system desktop?
Method 1: Create a new user.
1. Click the computer on the desktop, right click, Manage, select the user under computer management, right click, and select New User.
2. Fill in the user name and set the user password, and click Create! Restart the computer after creation or switch users created for themselves, and there will be no background black screen phenomenon.
Method 2: Retrieve the files deleted by mistake.
1. Open 360 Security Guard version 9. 1, click System Repair, and select Computer Expert (or click Computer Expert directly).
2. Select File Loss under System Performance.
3. Select the icon that the file was deleted by mistake.
4. Click Restore Deleted Files Now to install 360 File Restorer.
5. Installing 360 file restorer.
6.360 After the file restorer is successfully installed, click Start Scan to scan out the deleted files.
7. Scan the deletion date of the file, select the required file, and then click Restore the selected file.
8. Select the storage location of the restored files.
9. After the recovery is completed, you must restart your computer.
5. How to set the computer standby black screen?
Solution of black screen of display;
1. If the monitor is not used for a long time, the monitor will automatically switch to sleep energy-saving mode and the screen will be black.
Solution: Take win7 system as an example.
(1) Right-click a blank space on the desktop and select Personalize from the menu to open the Personalize Settings dialog box.
(2) Click the red box in the above figure and select "Screen Saver" to enter the screen saver setting dialog box.
(3) Set the screen saver to "None". Click "Change power settings" to enter the power settings dialog box.
(4) Click "Change Plan" to enter the change settings dialog box.
(5) In the blue box, click the drop-down triangle, select "Never", and then "Save Changes" to exit.
After setting, the display will no longer go out automatically.
Second, the display failure leads to a black screen.
On the internal power board of the display, the capacitor of the power output part is aging, leaking, bulging and invalid. When the monitor is just turned on, the power supply is normal in a short time because the capacitor is not completely dead, so it can display normally. After working for a period of time, the power supply is seriously insufficient, which leads to the LCD backlight going out and the display screen being black.
Solution: Send it to a professional monitor repair point, or even worse, damage the components, which costs about 30-50 yuan.
Three, the display signal line is loose or poor contact, resulting in video signals sent to the display intermittently, resulting in a black screen of the display.
Solution: Plug in, install and fix the monitor signal line again. If the fault still exists, the signal wire can be replaced for testing.
Fourth, the performance of the graphics card is faulty and unstable, which leads to the black screen of the display.
Solution:
1. Test after updating the graphics card driver. If the fault remains, directly replace the video card for testing.
Note: If an integrated graphics card is used, a separate graphics card can be installed for testing. Or directly replace the motherboard with an integrated graphics card for testing.
The performance of the motherboard is faulty and the operation is unstable, resulting in a black screen display. Solution: Replace the motherboard directly for testing.