It's likely that your PSU did fine for a while even though it was underpowered, but due to capacitor aging, it no longer provided the amount of power required for your system.
Also after my PC crashes, it won't turn on for quite a while. I tried reseting the PC by take out the power cord, and turning it on (draining the system)
I don't think that's a terrible thing to do for my pc, is it? D:
It doesn't make much sense that it is a psu issue. If it was, would my pc not just turn on right after it crashes? OR is there a lock-out or timer of some sort that doesnt lte it turn back on?
This is not an overheating issue, I've checked with a bunch of programs. All the temps are normal (or within a safe range)
everything does point to the psu. its under powered just by what power your system needs. your components are going flonky and causing error codes and blue screens. the only heat sensor for a psu is to put your hand by the exhaust and if it feels warmer than your room temp by 10c; its hot!
until you use another psu that is NOT suspect, ie a quality one that has sufficient wattage. any trouble shooting is moot. i have seen people insist it can't be their psu ( "my cooler master is 750 watts! it can't be THAT!" )and swap out cpus, ram, motherbords and still have problems until they switched psus and like magic the problems stopped.
you KNOW your psu is underpowered. you were fortunate you got 2 years of overloading it. now reality has come up and said, "no more!" so if you want to fix things, lets fix them right.