Help pc works fine at first then blacks out

[Windows 10]

I've been having trouble with my pc it starts off normally but the task bar is still loading and after a few seconds it goes black with the task bar still blinking but it still continues to be able to operate a browser and can still run games but it blinks white every few seconds if it's a game. I don't know if it's a motherboard issue or something else I've tried all types of fix of trouble shooting and doing everything but I couldn't fix it.

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