This has some resemblance to the problem I had some years ago when for some reason my GPU was thinking that it was connected to two monitors, so it would send picture to the other, non existing, phantom monitor and black screen to my real one. Almost nothing helped, except bios update that made the problem occur less frequently. So, just in case try ctrl-alt-delete when black screen occurs, this used to bring picture back for me when I had this problem.
Otherwise, try fresh Windows install, if nothing helps it's most likely faulty GPU, at least you know it's not PSU at this point.
Try switching GPU even for a shitty one to determine if it's faulty or not. If your CPU is Intel than most likely you have integrated GPU in your CPU, therefore you can test it.
Otherwise, try fresh Windows install, if nothing helps it's most likely faulty GPU, at least you know it's not PSU at this point.
Try switching GPU even for a shitty one to determine if it's faulty or not. If your CPU is Intel than most likely you have integrated GPU in your CPU, therefore you can test it.
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