One series of iMac G5 machines had a problem with faulty capacitors which would cause the machine to do many strange things.
i replace the ram in the computer in nov, apple said that was the problem. keep shutting down getting the kernal panic screen or the fan would come on at full blast and I have to shut it down . After I replaced it, it worked fine for a couple weeks but then started the same thing again. had to move so shut it down for a couple months. when I tried to restart just got the spinning circle. took it to apple they said probably hard drive. They started to back up old hard drive but was taking to long. Took it to a mac repair place and they said hard drive was bad. They replace that.
I took it home was very excited to see it start up but then the fans came on full blast and had to shut it down. restarted and worked on the computer for a while then got the kernel screen again,,, Called the place where I had hard drive fixed and they said it could be the RAM i put in..
So I took that out and the computer started and worked fine.. for a while.. In meantime called crucial where I got Ram and they are sending out new RAM since they said the one I had there was something wrong with it. (waiting for that to come) but in meantime can sometimes get it started and work on stuff but now getting kernel screen still and blowing fans!!! I am going crazy.. any help on what could be wrong and what I can do...???