I want to open the computer to play two games to relax, but when I turn on the computer, the screen is black. What's the matter? First, we consider the physical reasons, followed by the system failure reasons. Here are some solutions that I sorted out for your reference.
The solution of nothing when the computer is turned on with a black screen
Check whether the VGA data cable socket is loose!
Many times, it is because the data cable between the computer host and the monitor is loose, and no signal is transmitted to the monitor
Then check whether the VGA connector at the monitor and the VGA connector at the host are loose.
Judge according to the previous startup inspection!
In the past, after power on, the motherboard generally gave a "beep" to indicate that the power on was successful and the post was completed.
If you hear the beep, it means that there is no problem with your motherboard!
And the display has no display! It is possible that the graphics card is loose and the independent graphics card may be damaged!
Solution: replace the graphics card, connect the VGA data cable to the replaced graphics card interface to see if it can be displayed.
If you don't hear the beep, it may be caused by poor contact between the memory module and CPU on your motherboard.
Solution: of course, after pulling it out, wipe the golden finger (the part in contact with the motherboard) with a rubber difference, and then plug it in again to see if the fault can be solved
PS: even if many computer motherboards are turned on normally, they will not have the prompt sound I said. Then this step can also be used to eliminate the fault as long as the fan turns on after the motherboard is turned on and the display has not received the signal.
There is a sound after power on, but the display has not responded, even the "no signal" prompt at the moment of power on!
In addition to the possibility that the VGA cable mentioned in the first step is loose, it is also possible that the monitor power cord, power supply or the circuit board in the monitor are damaged.
After replacing the power cord or power supply (the notebook has power supply) with the replacement method, see whether it can successfully display "no signal". If it still fails, it is very likely that the display will hang up!
If there is no sound after starting up, if your computer can start up normally without sound before starting up, and you now have a black screen without any prompt when switching on and off the display, as in step 3, it may be a problem with the power cord or power supply, which can only be eliminated by changing the power cord or power cord, If there is a prompt "no signal", it is still the problem of signal transmission between the motherboard and the display.
Related reading: what are the reasons for the black screen when the computer is turned on
I. black screen of display
Black screen is a common problem in our computer startup. Black screen is usually caused by the following reasons:
1. Check whether the power supply of the monitor is turned on. If it is turned on, please check whether the power cord of the monitor is well connected. Remember, if you don't turn on the monitor first, it will cause the illusion of black screen. Don't forget.
2. If the power supply of the display has been turned on, the display of the power light of the display is normal, but there is no display on the screen. The reason may be that the brightness or contrast adjustment ratio of the display is inappropriate, and it does not rule out the possibility of hardware failure of the display card or poor contact between the display signal line and the interface of the display card.
II. The computer cannot be started
After the computer is turned on, the power indicator of the display works normally. The computer can be powered on but cannot be started. To solve the problem that the computer cannot start, it is recommended to use the replacement method. The so-called replacement method replaces the hardware that works normally into the faulty machine. If it can be started normally, it can judge which hardware has failed.
This fault is usually caused by the following reasons:
1. The power supply of the computer host is damaged. Although it can be started, it cannot be started normally. Please replace the power supply.
2. The COMS chip on the motherboard is damaged, especially after it is damaged by CIH virus, the computer cannot start normally.
3. The host power light is on and there is no other alarm sound. At this time, it may be CPU damage or poor contact.
4. There is no problem with the host device itself, but the host can be powered on but cannot self-test. At this time, the motherboard or CPU may be overclocked. Restore the default setting of BIOS. If you can't find the jumper to clear CMOS on the motherboard, you can directly take out the battery on the motherboard and short circuit the positive and negative electrodes for ten seconds.
5. The network card is damaged or in poor contact, which may also cause the machine to fail to start.
6. The graphics card and memory are incompatible with the motherboard, which will also cause the machine to fail to start.
7. The memory socket and graphics card socket on the motherboard are damaged.
8. The gold finger of the memory module is rusty. You can wipe the gold finger with newer RMB, and then plug it into the machine again to solve the fault.
9. There is a lot of dust in the host, resulting in poor contact of computer accessories. It is recommended to use an electric hair dryer or a wool rinse to clean the dust. Remember not to use the compressed air pump to clean the dust, because the compressed air pump is easy to produce water droplets during operation. With the air discharged, it will adhere to the motherboard and damage the computer accessories.
III. The machine can be started normally, but it cannot enter the operating system
The computer can start normally, and all the hardware runs normally, but it enters the operating system to work normally. The main fault phenomena and solutions are as follows:
1. The computer can be started normally, the display is normal before entering the operating system desktop, and the screen is black after entering the system desktop. This fault is generally caused by the high resolution setting of the display. Please enter from the installation mode, delete the graphics card driver and re-enter.
2. The computer can start normally. Stop before entering the operating system, and the prompt of boot error appears. Check whether the device startup setting or startup sequence in CMOS is wrong. At this time, you will be prompted to find interface devices such as a disk or IDE.
3. When the system starts, it prompts that the hard disk cannot be found. The hard disk power cable or data cable is not connected properly or damaged. Reconnect or replace it.
4. The hard disk of the machine works normally, and the prompt of error loading operating system appears. Please check whether the system partition is activated. If not, please use the partition software again to activate the partition.
5. The boot prompts the hard disk I / O error. Please check whether the hard disk can work normally. If the hard disk can work normally, the hard disk has installed restore software similar to the restore wizard and enabled I / O protection. Please download the eraser of the restore software to clear the original hard disk partition table, or use the fdisk / MBR command to restore the hard disk partition table.
IV. the machine can be started normally. After entering the operating system, there is no response or slow response for a long time
1. After entering, the mouse cursor is, but cannot be moved, and there is no response when pressing the numeric key (NumLock) on the keyboard. Please check whether the color of the display is 256 colors. When using Vientiane environment billing software, when the color is 256 colors, the machine will not respond. Please change the display settings to normal values after disabling the billing software.
2. When the machine enters the system, everything is normal. After working for a period of time, there will be no response. The mouse cannot move and the keyboard does not respond. At this time, it is generally next to the CPU of the motherboard, and the capacitor near the power block is damaged. Pay attention to observation, and you can see that there is a crack on the top of the capacitor, or there is a light yellow liquid mark next to the capacitor. This is a hardware damage. Please replace the motherboard. Generally, the motherboards produced by small manufacturers use recycled capacitors, which often explode.
3. The machine enters the operating system and runs normally. When running a program, the machine crashes, which is generally caused by the wrong version of the graphics card driver. The problem can be solved by replacing other versions of the driver.
4. After the machine enters the operating system, the mouse and keyboard react, and the normal operation can be carried out after a long time. This may be because there are too many startup software loaded in the computer startup item. Just cancel the automatic startup setting. If it is not loaded in the startup item, please run the msconfig command to check which programs are loaded automatically after startup in the startup option, and delete the irrelevant automatic loader.