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1. CPU is extremely overheated usually 100C+ (unlikely).
2. PSU fails to supply required power to the CPU or a critical piece of hardware so the bios powers off.
3. Bad overclocks on hardware.
Its likely #2, the most common cause is PSU simply doesnt have enough watts you should always have double the watts of the total TDP required available for all your hardware.
Its become standard for GFX cards to allow driver low level automatic overvolting on newer cards which means at times the GPU watt requirement can overclock randomly & be up to 175% its TDP easily. If you overclock your CPU and the volts are increased whatever the % increase is in increases the amount of watts pulled by same percentage.
Intel and amd both have built in additional low level CPU overclocks as well that can kick in and push the pc over its limits at max loads. Due to that it could potentially be #3 if you overclocked your cpu tested stable for a short time but never actually hit max loads and the built in overclocks kick in on top of it.
The rarest occurance is that some bad piece of hardware such as a faulty fan controller can have a short to the case and be pulling alot of the watts for no reason but usually in that situation the PC will not start at all.
Also avoid cheap PSUs its also become standard to rip off consumers as much as possible as far as PC hardware is concerned make sure its a Corsair/EVGA PSU.
As far as testing goes the best i can come up with is by running a program called intel burn test minimized in backround in a low priority set in task manager (its fine for amd cpus too), while running a program called furmark in a high priority fullscreen (CF/SLI enabled if available). The purpose is to max out both GPU and cpu and see if power fails like that again within a similar runtime as dead by daylight. If so you need a new stronger PSU.