G5 Power Supply Popped - Still works but fan speeds up/slows down nonstop!

Hi,
After applying a security update for Tiger 4.11 on my G5 1.6 a few hours later my machine made a bang/pop sound. It still powers up but once running it sounds like the machine is ramping up to speed and slowing down again. It does this continuously even when machine is running. Apple hardware test reports no problems but i'm concerned. Any ideas?
Thanks.
Dan

I had a similar problem (fans speeding up then slowing down). I have iStat installed so I was able to look at the rpm's of the fan (free widget btw). My CPU fans ranged from 2500 to 3200, oscilated all day long....up, down, up, down ...every few seconds. I noticed my CPU utilization was up, which was odd since my machine was somewhat idel. Looked at Activity monitor and saw my CPU's sometimes reached 90%. The application that was using the CPU's was the printmgr. Stopped the process and everything is ok. I know it is unrelated to the popping sound but you might ck the activity monitor to see what is going on.

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