Not knowing the hardware, like if you have onboard video or a video card make it hard to help.
Try booting in safe mode, this does not use the video drivers, if you had to install any, this uses generic windows drivers, this can root out a driver problem.
Try it on a different PC, laptop. If the same thing happens on a different system its usually the monitor, check the warranty at the MFG website.
See if you can get the menu on the monitor to come up, reset to default and see if helps, read manual for settings.
If you have windows, use devise MGR to update the video driver.
Inspect the power cord after you unplug it. both ends.
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