Question PC Crashing on startup

Oct 5, 2021
Hi All,
I recently upgraded most of my pc parts, and today as I was gaming my PC displayed a blue screen, then green squares, and then eventually there was no signal. However, the PC was still running with all fans still going etc. So I turned it off by holding down the power button, turned it back on and it was fine.

About 6 hours later it did the same thing, but this time when i tried to turn it back on it wouldnt work, first it couldnt even load the background picture for windows, crashed, and then no signal. So I turned it off again and left it for an hour or so, came back, and this time I was able to login to windows, but as soon as I could see my desktop it crashed again, green squares, then a blue screen, no signal.

Ive tried leaving it on to somehow uncrash now, hasn’t worked.

My PC Specs are:
CPU: AMD 5600X
GPU: GTX 780
Motherboard: ASRock x570 Steel Legend Wifi
Ram: 16gb Corsair Vengence
CPU Cooler: Custom Water Cooling (I have checked for leaks, and there seems to be no signs of any water, also yes I know its overkill :) )
Operating System: Windows 10
Storage: 1x 256gb SSD (with operating system on it), 1x 1TB HDD, 1x 1TB Samsung Evo 970 Evo Plus

Thanks and looking forward to any responses :)