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When the computer is running, it suddenly loses power. When it starts, the display always shows no signal. What is going on?

The computer suddenly loses power when it is running. At startup, the display
always shows no signal. What is going on?

Computer boot black screen no display no signal failure troubleshooting method (maximum may be motherboard
problem, first carefully check motherboard
there is no drum Capacitance). Step 1: First check if the external wiring of the computer is connected, and re-insert each connection to see if the fault is eliminated. Step 2: If the fault persists, then open the main box to check if there is any excess metal in the chassis, or a short circuit caused by the deformation of the motherboard. Smell the burnt smell in the chassis, whether there is a burnt chip on the motherboard, around the CPU. Whether the capacitance is damaged or not. Step 3: If not, then clean the dust on the motherboard and check if the computer is normal. Step 4: If the fault persists, then unplug the Reset line and other switches and indicators on the motherboard, and then use the screwdriver to short-circuit the switch to see if it can be turned on. Step 5: If you can't boot, then use the minimum system method, unplug the data cable of the hard disk, floppy drive, and CD-ROM drive, and then check if the computer can boot. If the computer monitor shows a boot screen, the problem is in these devices. Then, one or more devices are connected to the computer. When a device is connected, the fault reappears, indicating that the fault is caused by the device, and finally the device is inspected. Step 6: If the fault persists, the fault may be caused by memory, graphic card
, CPU, motherboard, etc. Then use the plug-in method, the exchange method, etc. to check the memory, graphic card
, CPU and other devices

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The graphics card driver is broken and repaired with the system installation disk

It should be the motherboard problem

If the host starts up normally, connect the monitor and plug it in once, which can basically be solved, but don't say that the video card is burned. This kind of accident has also happened.

There are many reasons for displaying no signal on the display.
First of all, look at the connection between the monitor and the host computer is not good. That is the line of the graphics card. It is possible that the line of the graphics card is not plugged in. Or the graphics card on your host is burned. So it shows no signal.

The host may burn out. Find someone to check it out.