I just opened up one of our iMac G5's (Rev. A) to install memory yesterday and saw 2 leaking capacitors and 2 bulging capacitors. Turns out Apple had some problems with these awhile back and have an extension repair service, but this machine does not fall under that (it's a refurb). In any case, I have no idea how long they've been bad, or if they are a risk (fire?). The machine seems to run just fine. Should I be concerned about this? We don't want to replace the logic board for $900. I don't want to try to replace the capacitors, although some people have done it succesfully. Any input appreciated.