Question Help, my PC does not turn on ?

[Singo08]

A little while ago I got a few upgrades to my PC and it worked like a charm, no issues, no bluescreens, nothing, everything was just perfectly fine. One day I turn my PC off to get some sleep and the next morning I wake up to turn it on the LED's flash 2 times with about half a second apart then the PC just turns off completely. It keeps on doing this no matter what I try. I've tried leaving it for half an hour, then I'll turn it off by the PSU and on again, same cycle repeats. I've tried everything to fix this and I've looked all over the internet for the solution but I can't find anything. I want to know the problem first before I go wasting my money on things that don't help me in any way, please if someone's had this before and fixed it or you know how to fix it please help me. Here is the list of my specs below.

Specs:
CPU: Ryzen 5 5600X
GPU: RX5800XT
MB: Gigabyte B550 Aorus Elite V2
PSU: Gigabyte 650W
RAM: Corsair Vengeance RGB Pro 2x8

 

[Singo08]

RX 6800XT*

 

[CountMike]

RX 6800XT*

Did you reset CMOS ?

 

[Singo08]

Did you reset CMOS ?

How do I do that?