I got 3 kernel panics in the past two days on my upgraded 533 MHz G4 DA Mac- not a good sign. The computer turned 10 years old last month. I backed-up the important files and opened up the computer today. After removing the dust, I found 1 exploded cap on the GigaDesigns 1.33 GHz G4 upgrade card, and the fan built into the original power supply isn't turning. There's a faint smoky smell inside the computer. I was planning on reinstalling the original 533 MHz G4 card for now, but need some guidance on the power supply fan. Is the PS fan supposed to turn all the time in this machine, or is it temp controlled? Where's a good source for power supplies?