We have discussed this issue on the cast before. There is a known issue with some single 1.8 GHz processor G5 Macs where they freeze and lock up more than they should. There is even a web site and petition, g5freeze.com, dedicated to the issue. Well many had hoped one of the hundreds of bug fixes in the just released 10.4.3 update would resolve the issue. It didn’t. The good news is, I have just found out a fix is in the works. A listener just got off the phone AppleCare and the rep said there is a firmware update due out before the end of the year. Apple just needed the 10.4.3 update to be released first. This information comes after the listener had several tech support calls and had his issue escalated, so I would tend to believe him. Stay tuned.