I was just wondering if there was some test i could run or something.
First, I agree with x BlueRobot and you don't want to do something that voids your warranty. Beyond that, there really is no test you can run but standard troubleshooting methods would require you ensure you are providing good, clean, stable power. So if me (and I was not concerned about warranties), I would swap in a known good power supply and see if the problems go away or continue.
21°C CPU temp is great but there are several heat sensitive devices inside the computer case. So you can't really rule heat out - yet. You can use a HW monitor to check your other temps. I suggest
HWiNFO64. But the amount of information it provides can be overwhelming so when using for the first time, I recommend you select “Sensors only” when prompted. Then scroll down to your motherboard’s section to see the temps.
You can also check your PSU's output voltages. According to the ATX Form Factor standard, PSUs must maintain voltage tolerances within ±5% of required specifications.
Acceptable tolerance maximums:
12VDC ±5% = 11.4 to 12.6VDC
5VDC ±5% = 4.75 to 5.25VDC
3.3VDC ±5% = 3.14 to 3.47VDC
It should be noted, however, to conclusively test a PSU, it must be done under a variety of expected loads, and output waveforms must be analyzed for power anomalies like
ripple. So conclusive testing can only be done using an oscilloscope or dedicated power supply analyzer. This is why swapping in a known good supply is often best for "normal" users (and many techs too).
