My iMac G5 powers on and runs fine for 20 to 60 minutes then locks up and all fans run at 100%

I thought my Hard drive had finally crashed and while replacing it (1TB Hitachi) I also replace the 512MB of RAM with 2 x 1Gb sticks of Crucial Memory.  While re-loading 10.4 the system locked up again and the fans started running at 100%.  I tried 3 more times and the same thing.  With in 20 to 30 minutes the system locks up and the fans roar.  I was told buy a friend the PSU had bad caps (all the MB caps look perfect) and I should replace it.  I purchased a used PSU from Ebay and this time I got the entire OS installed and 8 of the first 9 undates and then, it did it again.  I powered the iMac off and rebooted and now I get no bottom tool bar and in 50 to 60 minutes the same thing.  Please help, I am certified on Dell and HP but this iMac is driving me nuts. 

Take a closer look at the logic board caps.  They dont have be totally blown open to be bad.
If you look closely and see that they are bulging just a small bit they are BAD.
These symptoms sound like bad logic board caps.

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