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Monitor comes on a boot then goes black - Computer Monitors

Answers :

If your video card has 2 video outputs, try plugging into the other port. Sometimes the output will only be on one port when the computer boots into the OS. Also, it's possible that the PC is outputting a resolution that the monitor does not support. If you can try using a different monitor to adjust the resolution then try the trouble monitor again with the lower resolution.
Check video card it may be going out
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