Having some weird issues.

i don't suppose you've tried turning off you computer as uaual, but instead of powering back up, turn off you psu via its tiny switch, then press the power button to drain all residual power from the pc (around 10-15 second push is needed), then switch on the psu and see if the pc powers on afterwards.

pc's refusing to power straight back on could be down to a couple of things, firstly as others have mentioned above a failing psu can be one, but another cause is a failing motherboard, have you had the side panel off and looked closely at your board, you need to look at all the capacitors and check none are bulging or leaking, if you find anything that looks funny post a picture up for us to look at.

but i'd say the issue is either the psu or your motherboard (check your board as thats easy to look at, but don't be tempted to open your psu)
 
I haven't tried switching off and draining the residual power. I will give that a try shortly, (just about to have food).

I have just had a good look at the motherboard, and everything looks good, and very little dust inside.

It seems that i will have to try another PSU and see what happens, i dismissed it to begin with, because of it only being 3 years and a fairly decent brand. But i work in retail and i know even the best brands have 'bad days' in production. Thank you.
 
Hello again all, I haven't had much chance to get anything done yet, but i fired up Euro truck sim today, and instantly while on main menu or ingame my gpu was at 95-100% constantly, does this help to diagnose at all? I also fired up Counterstrike, the gpu started at 25% on main menu, and seemed to creep up very slowly, when it got to 45% load i turned the game off.
 
during high load your gpu will jump up to 95-100% these days the gpu does most of the leg work gaming wise, its good practice to have a fast cpu that can keep feeding the card data.

my 2080ti will sit around 15-30% load at idle but as soon as i startup destiny 2 at the beginning menu my card usage spikes to 99% and stays there until i exit the game or minimize it, so i'd say your pc is behaving quite normally in that respect, did turning off the psu and holding down the power button to drain the power solve the startup issue you were/are having?
 
Hello Wookiee, ok so today after launching those 2 games, i did a gpu bench test, just to put a bit of pressure on it to see what happened, and was all good, no crashes. Then with RealBench did a cpu benchmark, and it crashed within a minute. While it was off i drained the residual power by removing the cord, and holding the power switch on for around 20 seconds. So now back on windows, did a cpu-z bench and that worked ok, i'm about to move onto RealBench or OCCTPT now and see if it crashes again. All voltages seemed within safe boundaries while doing cpu-z bench. Will be back shortly with results of what happened.
 
Ok first i went with OCCTPT, cpu test, it lasted 10 seconds before stopping with an error, and with a picture and graph, CPU went straight to 100% as soon as the test started. I have a folder with seperate graphs for the results, why it failed. I can't quite understand them myself, but can upload whichever ones if you need to see? Thanks
 
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have you got any cpu overclock applied?, if the gpu passes but the cpu test fails that points to a cpu problem.

running OCCTPT on a stock cpu is hard enough to run let alone a overclocked one, those tests are designed to absolutely hammer cpu's so the jump to 100% is normal, likely temps would have shot up pretty fast too
 
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