I'm running a G5 1.6, 1.2Gig ram with the latest update on Tiger. My browser is SeaMonkey. As to programs, nothing exotic: iTunes 7, Word et al; Toast; Adium; iPhoto. BTW, I have my wife and son as users with myself as the administrator. Lately the G5 has been freezing/locking up. I'll be using SeaMonkey and maybe have another program open and it just freezes. The only solution is to power off and then power back up. I have used the Disk Utility a number of times and will get the same problem. Occasionally, I notice that the fans start to spin up and know that this is a sign of impending lock up. Just yesterday a grey screen came up and told me I had to reboot. Help. I'm considering buying TechTool Pro or perhaps Disc Warrior to try and get to the bottom of the problem. Your recommendations will be greatly appreciated. Thanks in advance. Cheers