[Oni]

The cpu is a 3.20 Ghz Duo-Core. Yes. Sadly it's a Duo-Core but it works. The PSU is 600 Watts. I just replaced my 550 Watt PSU with the new one in case it was he PSU.

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The bad news is. Last night, after re-attempting to fix the issue. Now all the fans only spin for about 1.8 seconds. Then go out....

Well, I think you either need to get a bigger PSU or replace the CPU (which could be expensive). As I mentioned, you could also add a liquid cooling system in there. Not sure how many watts your computer is already taking. If you're sure that 600 is enough, then it's the CPU.