My G5 2.5GHz DP Powermac started making rattling noises and then the fans starting periodically running wild. I thought to reboot the computer to the DVD and repair permissions, but when I tried it wouldn't boot. Normally I just put it to sleep at nights and rarely shut it down or reboot, so who knows how long this problem has been brewing. Anyways, I took it to the Apple store yesterday and when they opened it up you could see coolant leaking from under the panel that covers the CPUs. Not good! The Genius went and got a repair tech to look at it as well. He said if it is the coolant system, it would cost me half the cost of a new computer to fix it That's at least $1,000 to fix a leak! My plumber doesn't charge that much and he makes house calls. They're going to take it apart and call me back in a couple of days, but the prognosis isn't good and there is no way I'm going to pay that much to fix a 4 year old computer, and I can't afford $2K+ to buy a Mac Pro. Fortunately, I have a 24" iMac and 2 older Powerbooks around so I don't really need to replace it, although I will miss the fast graphics of the Powermac. The iMac graphics card leave a lot to be desired (NVIDIA GeForce 7600 GT). Other than salvaging my hard drive, I really don't know what to do with it. It is a very expensive boat anchor now. I thought I might be able to find a buyer for the 3.5 GB of RAM and maybe the Superdrive, but other than that it is pretty much useless.