Computer black screen step-by-Step Troubleshooting method

1th step: If not, then clean the motherboard dust, and then check the computer is normal.

The 2nd step: first check the computer's external wiring is connected, the various lines plug again to see if the fault is excluded.

3rd step: If the fault is still, then open the mainframe box to see if there is any excess metal in the chassis, or the motherboard deformation caused by the short-circuit, smell the chassis has no burnt paste flavor, the motherboard has no burned chips, the CPU around the capacitor is damaged.

The 4th step: If the fault is still, then unplug the motherboard on the reset line and other switches, led lines, and then use a screwdriver short-circuit switch, see whether can boot.

5th: If you can not boot, and then use the minimum system method, the hard drive, floppy drive, optical drive data cable unplug, and then check whether the computer can boot, if the computer monitor appears on the screen, then the problem in these several devices. Then one by one the above several devices into the computer, when the access to a certain device, the failure to reproduce, indicating that the fault is caused by this equipment, and finally focus on the inspection of this equipment.

6th step: If the fault is still, the failure may be caused by memory, video card, CPU, motherboard and other devices. Then use the interpolation method, the Exchange method and other methods to check the memory, graphics, CPU and other devices are normal, if there are damaged equipment, replacement of damaged equipment.

7th step: If the memory, graphics, CPU and other devices are normal, and then the BIOS discharge, using isolation method, the motherboard is placed outside the chassis, the memory, graphics, CPU, etc. for testing, if the computer can be shown, and then the motherboard installed in the chassis test until the cause of the failure found. If the failure is still required to return to the manufacturer to repair the motherboard.

8th step: The computer boot without display but there is alarm sound, when the computer boot up, the system BIOS began to post (Power-on self-test), when the computer detected a fatal error in a device, then control the speaker issued a sound report error. Therefore, there may be no power on the display of alarm sound failure. For computer boot without the alarm sound failure can be based on the meaning of the BIOS alarm, to check the failure of the equipment to troubleshoot.