There is no signal on the monitor when the computer is turned on, and the keyboard and mouse do not light up. Solution

1. First, check whether the computer has power. This may happen if the computer has no power. Check whether the host starts normally. If it does not start normally, check the hardware. The keyboard check will not affect the machine display. Check whether the hardware is in poor contact or the accessories are oxidized.

2. When the computer starts up, the screen goes black. The power supply fan and CPU fan do not move, the indicator light on the motherboard does not light up, and the computer does not respond in any way. At this time, you should first check whether the power socket is powered on, whether the various power cables are good, and whether the connections are normal. If confirmed, please replace the power supply and try again.

3. The running memory is loose or the gold finger oxidizes the computer. Loose memory strips will cause the computer to be unable to boot normally. This is more likely to happen, so it is recommended to try it first.

4. a. First check whether the monitor is powered on normally, check whether the monitor indicator light is on normally, and ensure that the monitor power cord is correctly connected.

5. First check whether the signal cable of the computer host monitor and the host interface are loose and can be plugged or unplugged. Just repair the signal cable of the monitor and see if the signal cable interface is damaged. If not, change the line.

6. Open the device manager and find the keyboard option. When the computer is turned on, the host power light and display light are on, the host work light is off, and the mouse and keyboard are unresponsive. After turning on the computer, it cannot be turned off and the display screen goes black. When the computer is turned on, the host power light and display light are on: Description.

After the host is turned on, the display screen, keyboard and mouse do not respond.

1. It may be that the connecting cables of the monitor and various accessories are not firmly connected to the host; it may also be due to the system The computer cannot recognize it due to BUG. You can try to force restart the computer and use the options to repair the system.

2. If the screen has no display after the host is turned on (the power indicator light does not light up) or displays "no sighal" and no signal, the former indicates that there is no power or the connection is in poor contact, and the latter generally indicates that the memory module has poor contact. , because the memory failed to pass the power-on self-test, the subsequent keyboard and mouse will of course not respond.

3. Host power supply problems are generally caused by insufficient power dissipation or poor performance of its load (such as motherboard, hard disk, graphics card, etc.). Remove the memory module, wipe the gold finger of the memory module with a clean eraser, insert the memory module into another slot, and then turn on the computer to check.

4. After the computer is turned on, the host runs. The screen is unresponsive, the keyboard lights are not on, and the mouse (USP) has power. Check whether any hardware plugs are not plugged in properly. For example, it's loose or fallen off. Things that are usually easily overlooked are the CPU power supply plug, loose memory or graphics card, which usually just re-plug and unplug.

5. Check whether the connection cables between the monitor, keyboard and host are normal. It may be caused by poor contact; if there is no problem with the connection cables, there may be a problem with the computer host hardware.

The computer will not turn on, the screen will be black, the keyboard will not light up

1. The monitor will not respond when the computer is turned on. This is most likely caused by a computer malfunction that failed to pass the power-on self-test.

2. The computer cannot be turned on and the screen is black and the keyboard is not lit. 1. Press the "NumLock" or "Caps Lock" button above the small pad on the right side of the keyboard and check whether the keyboard indicator light is on. If yes, it means you can get into the system except the video output part fails. If there is no response, there may be a bad contact with the computer hardware.

3. If the keyboard light does not light up, it means there is a problem with the memory, CPU, motherboard, or power supply. Solution: The keyboard light does not light up. First wipe the memory stick with an eraser and check whether there are any burn marks on the gold finger of the memory stick. Replace the memory slot.

4. When the computer is turned on, the screen goes black. The power supply fan and CPU fan do not move, the indicator light on the motherboard does not light up, and the computer does not respond in any way. At this time, you should first check whether the power socket is powered on, whether the various power cables are good, and whether the connections are normal. If confirmed, please replace the power supply and try again.

5. If the problem is large or small, first make sure the connections of each part are still not good. Reason 1: The weather is too cold and the computer cannot start normally. 2: If your hardware has not had problems before. You can redo the system. When the computer is turned on, it displays a black screen with white text, and the keyboard indicator light automatically turns off.

The computer turns on and the screen goes black without displaying anything, and the mouse does not light up

There is a motherboard problem. Solution: Unplug the power supply, remove the motherboard battery, jump the CMOS jumper to the colse position, keep it there for more than five minutes, install the battery, and restore the jumper. Just OK. Or use a paper clip to connect the positive and negative terminals of the CMOS on the motherboard for more than five minutes, and it will be OK. There is a problem with the power supply.

The computer starts up with a black screen, the power supply fan and CPU fan do not move, the indicator light on the motherboard does not light up, and the computer does not respond at all. At this time, you should first check whether the power socket is powered on, whether the various power cables are good, and whether the connections are normal. If confirmed, please replace the power supply and try again.

If it is not due to memory, please change to a normal CPU and start the test again.

What to do if the computer screen suddenly goes black without a mouse?

1. Disable 3D acceleration or upgrade the graphics card driver. If Windows has been configured for 3D acceleration, but the graphics card does not support this function, then when running the game Or multimedia programs, a "black screen" failure may occur.

2. Solution to the setting reason: If the desktop icon is not displayed after booting, right-click on the desktop and view --- Show desktop icons. The icon will appear on your desktop. Desktop functions are normal.

3. If the black screen still appears, it is recommended to replace the motherboard; Check whether the system has installed software and update patches. If so, please uninstall the update files; If the computer restarts after installing the software and is updating, which results in a black screen, just wait for the update to be completed; OK Enter safe mode to repair the computer. If you cannot enter safe mode, please reinstall the system.

After the computer starts, there is a beeping sound, and soon after entering the BIOS screen, the screen goes black and there is no signal, and the keyboard and mouse do not light up.

The computer starts up and there is a beeping sound. The keyboard light does not light up. The monitor has no display. There is a problem with the graphics card or memory. . Step 1: Unplug the memory, wipe it, reinstall it and start it. Step 2: Unplug the graphics card, wipe it, reinstall it and start it.

The computer starts up with a black screen, the power supply fan and CPU fan do not move, the indicator light on the motherboard does not light up, and the computer does not respond at all. At this time, you should first check whether the power socket is powered on, whether the various power cables are good, and whether the connections are normal. If confirmed, please replace the power supply and try again.

Booting into the BIOS may be because the BIOS battery is almost out of power. If so, replace the BIOS battery. If you are not restoring the BIOS to factory settings, you can also try discharging the BIOS battery. If that doesn't work, repair the system.

You can try shorting the switch with a wire. If it doesn't work, you can only try replacing a motherboard.

If this situation is caused by a computer that has been used for a long time, it may be caused by loose memory or too much dust. You can take out the memory and use an eraser or a clean glasses cloth to wipe the metal under the memory. Contact the board and wipe off the dust on it to prevent the computer from being unable to start normally due to poor contact of the memory module.

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