Ok. So a few weeks ago, back in July, my PC was getting incredibly high temperatures, around 90C playing a game like PUBG. Soon enough, my pc started hard resetting with no errors, which to me seemed like a heating issue, as my temps shot immediately up from around 60 to 80 within seconds of the game starting, and then my PC would hard reset and reboot. I bought new thermal paste and when it arrived, I applied it to the CPU, a liberal amount which should've been no problem.
I put everything back together, putting the Heat-sink back on, and plug the power cable back into my PSU. I go to start up my PC once all the cables are in, and... It doesn't boot. Mind you, the light on the inside of my case; on the motherboard is on, and the light on my GPU is on too. Eventually, it does turn on, and I go along with my day. I try to start up Titanfall 2, which I know my pc can run, justt about anyways. Aaand the same problem occurs. The pc shuts itself down and reboots. So, I didn't play Titanfall 2. Rather, I start up PUBG and try to play that, Which again, I've played pubg for the best part of 50 hours on steam with no problems at all. As soon as I reach the menu of PUBG, my PC reboots instantly, same as TF2. So I don't play anything, I just sit around on YouTube and discord... and not to mention the temps on Afterburner were all fucky, sitting around 100C for no apparent reason. I'd applied new Thermal paste, and there shouldn't be much of an issue.
Maybe it takes a while for the paste to set and begin to transfer heat to the heatsink? I don't have a clue. Now, my pc refuses to start up after I put it into hibernation mode after I was done for the night. As soon as I did that, roughly a minute after, my PC didn't receive or output any power, as in sleep mode, my PC still supplies power to the USB ports which is how I charge my phone.. My phone wasn't charging, and my PC didn't respond to the clicking of my mouse or my keyboard and it refused to power on.
This is where I'm at now.
My PC does not turn on at all. There IS power, I have switched the RAM around, taken out and tried using a different GPU, Unplugging the GPU entirely.
Taknig everything out of the PC. It just refuses to boot. It could either be my CPU, or my power supply. I have no clue and I'm so confused t o what it could be. It could either be my motherboard, or my CPU. But if it's not, then I don't want to take the chance and waste money on parts.
Any advice is 100% appreciated because I'm entirely lost.
Thanks in advance.