Hi,
my computer started to shut off by itself. It started yesterday when I was playing games, it turned off. I figured its been running all day, so I gave it a 20 minute break and powered it back on. After working for another 20 mins, it shut off.
Now when I try to turn it on, it shuts off after two seconds or so before I can look up on my screen to really see anything.
I've identified that its not my Video Card or my Sound card.

There's one weird detail, after the pc shuts off I have to flip the switch on the back of my power supply off and on before I can attempt to turn it on again. Otherwise it doesnt even respond when I push the power button.

Any help would be greatly appreciated.

Try a different power source.

If it is not a Power issue it is most likely heat.

Have you ever cleaned this computer inside?