The computer screen is black when it is hot.

1. Check whether the host power supply works normally. First, determine whether the host system is powered on by checking whether the power indicator light on the panel of the host chassis is on and whether the power fan rotates. Secondly, use a multimeter to check whether the external voltage meets the requirements. If the voltage is too high or too low, it may lead to the automatic shutdown protection of the host power supply overvoltage or undervoltage circuit. In addition, it is also very important to check the quality of the power switch and reset key and the correctness of the connection with the motherboard, because many inferior chassis power switches and reset keys are often damaged after being used several times, resulting in a black screen and no display. If the power supply is damaged, it can be solved by replacing the power supply.

2. Check whether the power supply of the monitor is connected correctly. When the monitor is powered on, there is a "click" sound, and the power indicator light of the monitor is on. When the user moves to the monitor screen, there will be a hissing sound, and the hairs on the back of the hand will stand up.

3. Check whether the signal line of the monitor is in good contact with the graphics card. If there are a lot of dirty things at the interface, broken needles and other damage will lead to poor contact and the display will be black.

4. Check whether the graphics card is in good contact with the motherboard. If the display screen is black, the speaker in the host makes a long beep, indicating that there is a problem with the connection between the graphics card and the motherboard, or there is a problem with the connection between the graphics card and the monitor. You can focus on checking whether the contact of the slot is good or not, whether there are foreign objects in the slot, and replace the graphics card with the motherboard slot for testing, so as to judge whether there is a problem with the slot.

5. Check whether the graphics card can work normally. Check whether the chip on the graphics card can burn, whether the cooling fan on the graphics card works and whether the cooling performance is good. Replace it with a working graphics card, and rule out whether the graphics card is damaged.

6. Check whether the contact between the memory stick and the motherboard is good and whether the quality of the memory stick is excellent. If the computer turns on the black screen and the host emits a continuous beep, it is likely that there is something wrong with the memory stick. You can focus on checking the installation contact between the memory and the memory stick, and then unplug the memory stick or replace it with a new one.

7. Check whether the fan in the chassis rotates. If the cooling fan in the chassis is damaged, it will cause poor heat dissipation, and in severe cases, it will cause damage to CPU and other components or automatic shutdown protection of the computer, and give an alarm sound.

8. Check whether the slots of other boards (such as sound card, decompression card, graphics card and acquisition card) are in good condition with the motherboard and whether the drive signal line is connected correctly. This point is often easily overlooked by many people. It is generally believed that the black screen of the computer is a problem of the display part, which has nothing to do with other equipment. In fact, due to the incorrect installation of sound cards and other equipment, it is difficult to complete the system initialization, especially the data line interface of the hard disk, which is also easy to cause the failure of no display.

9. Check whether the CPU is overclocked, whether the CPU is in good contact with the motherboard, and whether the CPU cooling fan is in good condition. If overclocking causes a black screen, jump the CPU back to its original frequency. If the contact is poor, remove and reinstall the CPU, and use a high-quality high-power fan to dissipate heat for the CPU.

10, check the parameter settings. Check whether the CMOS parameters are set correctly. If the CMOS parameters are set incorrectly and the computer cannot start, you must open the chassis and restore the CMOS default settings.

1 1. Check whether the virus causes the display to turn black. If the display screen is black due to virus, you can use the latest antivirus software to deal with it, and sometimes you need to rewrite the BIOS program.

12. If the internal circuit fault of the monitor causes the black screen or the picture tube to be damaged, please find a professional to repair it.