Black screen fault resolution for display

1, check the host power supply, the work is normal. First, by looking at the main chassis panel power LED light, and whether the power fan to rotate to determine the host system has not been a power supply.

Second, the use of multimeter to check whether the external voltage compliance requirements, voltage too high or too low can cause the host power supply overvoltage or undervoltage circuit of the automatic stop protection.

In addition, the key to check the power switch and the quality of the reset key and their connection with the motherboard is correct or not are very important, because many inferior chassis power switch and reset keys often take several times after the damage, causing the whole machine black screen without any display. If the power supply is damaged, the replacement power supply will be resolved.

2. Check whether the power supply of the monitor is connected well. The monitor is powered by a "cha" sound, and the Monitor's power indicator light, the user moved to the monitor screen with a "hissing" sound, the back of the hand hair pricked up.

3, check the monitor signal line and display card contact is good. If the interface has a lot of dirt, broken needles and other damage will lead to poor contact, display black screen.

4, check the display card contact with the motherboard is good. If the monitor is black screen and the loudspeaker in the main engine emits a long two short beeps, it indicates that there is a problem with the connection between the display card and the motherboard, or that there is a problem with the connection between the display card and the monitor, it is important to check whether there is a foreign body in the slot, and the card will be changed to a motherboard slot for testing to determine if there is a problem

5, check whether the display card can work properly. See if the chip on the display card can scorch, crack, and whether the cooling fan on the display card is working and the thermal performance is good. Swap out a working display card to troubleshoot whether the display card is damaged.

6, check the memory of the board and the contact is good, the quality of the memory bar is perfect. If the computer started black screen and the host issued a continuous beep, most of the memory is a problem, you can focus on the memory and memory slot installation contact, the memory strip reseated once, or replace the new memory bar.

7, check the chassis fan rotation. If the cooling fan in the chassis is damaged, it will cause heat dissipation, serious people will cause the CPU and other parts damaged or computer automatic shutdown protection, and issued a sound alarm.

8, check other board card (such as sound card, decompression card, video, capture card) and the motherboard slot is good and drive signal cable connection is correct. This is a point that many people tend to overlook easily.

It is generally believed that the computer black screen is part of the problem of the monitor, unrelated to other devices. In fact, because the sound card and other equipment installation is not correct, resulting in the system initialization difficult to complete, especially the hard disk data line interface, but also easy to cause the failure of the display.

9, check the CPU is overclocking use, CPU and motherboard contact is good, CPU cooling fan is intact. If overclocking use causes the black screen, then the CPU jumps back to the original frequency is OK. If the contact is bad, then remove the CPU to be reinstalled, and use high quality high-power fan to the CPU cooling.

10, check the parameter settings. Check the CMOS parameter settings are correct, if the CMOS parameters are not set up to cause a black screen, the computer does not start, you must open the chassis, to restore the CMOS default settings.

11, check whether the virus caused the display black screen. If the virus caused the display black screen, the latest version of anti-virus software can be processed, sometimes need to rewrite the BIOS program.

12, if the monitor internal circuit failure caused black screen or picture tube damage, you should ask professional maintenance.