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Also try to unistall both Intel and Nvidia drivers at the same time. It may help. I used to have this same problem, but after a few Insider Windows updates all went back to normal again. If you are on Preview builds then just disable the card for now and wait for next build to be released or downgrade to version 1607 or even 1511 of Windows. Your problem could be as simple as Windows not being compatible for your current hardware setup, so testing million drivers will just waste your time.
Oh, almost forgot, let Windows download the best drivers for you, don't upgrade them manually.
How can one downgrade to other version without Windows automatically upgrading itself with Windows update?
Out of curiosity, what are your thoughts on this (it's not long): Low resolution on Windows 10 boot screen
Solved Low resolution on Windows 10 boot screen - Windows 10 Forums
It seems like it isn't fixing your problems. I'd say that GPU is dead.
Any luck yet?
Disable dedicated GPU in BIOS so you can boot using onboard graphics. If it works then I'm certain the GPU is dead.