The computer is set to standby or sleep mode, which will cause the computer to automatically turn off the monitor and enter sleep mode after a period of time. Commonly known as "black screen" (after the system switches to sleep state, the system will transfer all the data in the memory to the hibernation file on the hard disk, and then turn off the power of all devices except the memory; Its characteristics are similar to shutdown, but it is not actually shutdown, just to save energy and protect hardware.
Command to release standby or sleep mode: press and hold the power button 1-2 seconds to release the black screen. (Computers that usually do not need to be restarted)
Methods to modify or cancel standby and sleep time:
Win-XP system:
Right-click a blank space on the desktop, click Properties, select Screen Saver, and then click the Power button. In the pop-up dialog box, select the "Turn off the monitor" option-"Never", then select the "System Standby" option-"Never" or set your own standby time to confirm the exit.
Win7-win8-win 10 system:
Double-click the "computer" icon-open the control panel-power options-change the plan settings-use the computer to go to sleep-never, or set the sleep time yourself, and then select the "Turn off the monitor" option-never, or set the turn-off time yourself. (Note: If "Never" is displayed and the screen is still blank, please reset it as follows: ① Please click "Change advanced power settings"-"Sleep"-"Sleep after this time"-"Never" below; ② Click "Change advanced power settings"-"Sleep"-"Sleep after this time"-"Never" below. This should be fine after it is set up. If the problem still exists, please click "Restore (this) plan defaults", then restart the computer and set it again according to the above steps. )
Alternatively, double-click the computer icon-open the control panel-hardware and sound-power options-change the schedule settings-use the computer to go to sleep-never, or set the sleep time yourself, and then select the "Turn off the monitor" option-never, or set the turn-off time yourself. (Note: If "Never" is displayed and the screen is still blank, please reset it as follows: ① Please click "Change advanced power settings"-"Sleep"-"Sleep after this time"-"Never" below; ② Click "Change advanced power settings"-"Sleep"-"Sleep after this time"-"Never" below. This should be fine after it is set up. If the problem still exists, please click "Restore (this) plan defaults", then restart the computer and set it again according to the above steps. )
You set it according to the above method, and it will take effect after restarting the computer.
If the problem persists:
1. First check whether the graphics card is in poor contact with the motherboard, remove the graphics card, wipe the gold finger of the graphics card with fine sandpaper, and then plug it in firmly.
2. It may also be that the connection between the monitor and the power board is poor. Please plug in the connection firmly and try again.
3. There is something wrong with the graphics card. Ask a professional to help you identify whether there is a problem with the graphics card.
4. There is something wrong with the monitor itself. Identification method, try a good monitor on another computer.
5. There is something wrong with the hard disk. Please use Master Lu to check the health of the hard disk. If there are more bad points, you need to replace the hard disk.
2. My computer has a black screen and the monitor is in sleep mode, so I can't turn it on. What should I do?
Whether it is a compatible machine or a card machine, there will be inexplicable crashes in the process of use.
Crash is a common fault phenomenon, and it is also a difficult disease to solve. Especially when the computer crashes, we can't use software or tools to detect the machine at this time, and it is often a headache to maintain it.
1. The general manifestations of the crash are: 1) After power-on, there is no host and no response, the power indicator light does not light up, and the fan does not turn; 2) The system can't start normally, and the screen suddenly stops during the startup process; 3) The display screen is black when it is turned on or black when it is used; 4) The image is "solidified" and not updated, but the keyboard light can be turned on and off; 5) The keyboard is locked and there is no response; 6) The mouse can move normally but the host does not respond; 7) Abnormal interruption of software operation; 8) Blue screens often appear. 9) Frequently report memory errors or overflows.
How can we quickly solve the fault and get the machine back to normal work? 2. Failure manifestations Specifically, the crash phenomenon can be divided into hardware and software. : 1. Hardware-induced crashes often include: unstable mains voltage, too low or too high output voltage of host power supply, too high chassis temperature, too high memory temperature, too high CPU temperature, overclocking, interference, peripheral failure, poor contact of board card, poor contact of data line connected between host and peripheral, etc.
(1) The mains voltage is unstable. The working range of computer voltage is generally between 180 V and 240 V. When the voltage is lower than 180V, the output voltage of the switching power supply is too low or protected, and the host is easy to restart or automatically shut down. When the voltage is higher than 240V, the input voltage of the commercial power exceeds the allowable working range of the host power supply. However, due to the discrete components of the circuit, the power supply may not be protected at this time, and the output of the secondary power supply may be too high, which may also cause a crash. (2) The host power supply is not completely damaged. When the internal circuit of the host power supply is damaged, the voltage output may be biased or the current output is insufficient, resulting in insufficient effective load rate. At this time, there will also be a crash phenomenon.
At present, the switching power supply used by computer host mostly adopts TL494 or similar PWM control chip, and the comparator generally adopts LM339 or LM393 to control and judge whether the host sends out switching signals. When the chip fails, it will appear that after we short-circuit the green line and the black line with wires (some books require the use of 100O resistor, which is actually unnecessary, and the internal circuit of the power supply has been connected in series with a resistor of about 2K, even if the short-circuit current is only a few milliamps), the fan of the power supply works, and the output voltage of each channel is basically normal when measured with a multimeter.
But the power supply can't work normally after it is connected to the circuit. This is mainly caused by the voltage sampling error after the chip is damaged, so it can't carry a heavy load, so just replace the chip of the same model.
I once met a brand-name switching power supply. After using a 7A686964616FE59EE7AD 943133361306334 for half a year, the host often crashes or cannot be started. Finally, the switching power supply is checked, and it is found that the output of +5V is as high as 5.86V, while +65438. (3) Poor cooling of the chassis and too much dust in the chassis will also cause the system to crash.
Dust is the enemy of computers. Too much dust on the surface of CPU, chip and fan will lead to poor heat dissipation or poor contact of these components. At the same time, the dust on the printed circuit board often leads to short circuit in wet environment. Both situations will lead to collapse.
This kind of situation is common in some old computers that are turned on after one or two years, and there is no response or "beep" when they are turned on, and they often crash after summer. Because the temperature sensor of PIV computer CPU is integrated into the CPU, its temperature measurement is accurate, so the CPU temperature is generally about 50℃ when it is turned on, which is much higher than the detection temperature of SOCKET 370 CPU (about 30℃).
However, due to the high calorific value of PIVCPU, when selecting the CPU fan, the corresponding CPU fan must be selected according to the type of CPU, so as to avoid the situation of small horse-drawn carts, otherwise the machine will continue to crash. Solution: We can sweep away the dust with a brush, and then clean up the ash tip of the board with a hair dryer (cold air stall).
Attention: Don't leave the hair and cotton of brushes and cotton swabs on the circuit boards and components, which will become the new crash source. If we can clean the dust inside the host and monitor once a year, our love machine will not be * * * for no reason.
(4) Overclocking Many DIY friends like to improve the performance of their computers by overclocking, so that they can do more with less money. But there are also great hidden dangers: it may cause a crash, or it may cause the complete scrapping of CPU, memory and hard disk.
I had an overclocking experience, and the motherboard of 66 band was hard overclocked by 83 band. It worked well at first. Just when I was complacent about my little experiment, two days later, when I was running, I was suddenly prompted that I couldn't find my hard disk. I didn't care at first, but it became more and more frequent, and finally I couldn't find the hard disk in CMOS.
Especially now the integration of P4CPU is getting higher and higher, and some of them have adopted 0.09 micron wire. When we overclock, it is easy to cause excessive attenuation of electrons inside the CPU, and finally the connecting wire is completely broken, resulting in CPU scrapping. (5) The jumper of the motherboard is wrong. The motherboard adopts external frequency doubling and frequency doubling routing or pull-out switch, and the power supply voltage of CPU or memory is set by jumper. At this time, it is necessary to set the main frequency and frequency doubling parameters of the corresponding CPU and the corresponding use voltage according to the instructions.
If the setting is wrong, it may cause overclocking to the CPU. If the setting parameters are too high, it may lead to a black screen or crash as soon as you enter the system. Sometimes we don't jump the jumper back to its original position after discharging CMOS, and then the black screen doesn't start when it is powered on.
Some motherboards support both SD and DDR memory. Note that there are jumper selection voltage settings of +2.5V and +3.3V on the motherboard. In particular, the core voltage setting of CPU should not be wrong, otherwise it will easily lead to CPU scrapping.
(6) The internal circuits of peripherals such as monitors, printers and M are damaged. Is damaged, they will short-circuit their corresponding ports after connecting to the host. At this time, the host will not pass the self-test or cause power protection. Some engraving machines power on the programmer first, and then power on the host computer, and then the host computer won't start.
3. What does it mean that the computer boot screen shows entering sleep mode?
This is due to the poor support of hard disk for power management function. Solution: Right-click the desktop, select Properties → Screen Saver → Settings → Power, click the power button to enter the power management interface, and set the "Shut down the hard disk" item to "Never". The solution is: 1) Press F8 when starting to open the advanced options menu. Let go and choose.
After logging in: right-click the desktop and select Properties/Settings/Advanced/Adapter/List all modes/Drag the up and down scroll bars, click and select "1024*768, true color (32 bits), 75 Hz, LCD and 60 Hz", click OK, click OK, and finally restart the computer (or set the appropriate resolution yourself). If there is anything, it is caused by hardware. Pull out the motherboard battery to discharge, plug in and out the memory, and clear the gray of the graphics card. Check whether there is anything wrong with the hard disk. If it doesn't work, repair it (first soft and then hard, restore the system or reinstall it). If not, maybe there is something wrong with the graphics card driver? )。
2) If this is always the case, first soft and then hard, reinstall the operating system, and do not install software, patches, drivers, etc. , see if there is any problem with the boot. Don't install drivers, patches and software step by step. If you find something inappropriate, don't install it. Please note: if you restore or reinstall the system, when installing drivers, patches and software, you must not install anything that will affect your accident this time, otherwise the restoration or reinstallation will be in vain. 3) Hardware, such as hard disk and memory. , whether there is a problem, CPU and other hardware temperature is on the high side, if it is caused by hardware problems, it is recommended to repair.
4. How to release the sleep mode of the computer, but what should I do if the screen is black?
How to cancel the hibernation state of a computer:
Set through the control panel.
1. Open the control panel and find the hardware and sound options;
2. Click on the hardware and sound, open the power option, and click on the power plan;
3. Click Balance in the preferred plan and change the plan settings;
4. After 4.WIN 7 is installed, the default is to choose to set the computer hibernation state, and the settings appear as follows;
5. Set "Never" to turn off the monitor, put the computer to sleep, and then press "Save Changes";
6. setup.
5. How to turn on the black screen when the computer enters sleep mode?
Turn off the power supply, turn on the chassis, plug in the graphics card again, plug in the data cable between the monitor and the graphics card, and turn on the computer.
Computer sleep mode is a mode in which the computer is in standby state.
Windowsxp Click Start → Find "Shutdown Computer" → Click "Shutdown Computer" → See "Standby", "Shutdown" and "Restart" → We choose "Standby" → At this point, your computer has entered sleep mode. Compared with a windows87 computer, when you find "turn off the computer", just select "Sleep" in the drop-down list, without clicking "Turn off". Slide the mouse from top to bottom on the right to find "Settings" and click "Sleep" in "Power".