Hey everyone. I've searched the forums, and have come up with a couple of similar threads, but none seemed to have the answer. I just installed Leopard twice on my G5. The system is a 2.5GHz dual-processor (not dual-core) G5. I can check the RAM on Monday when I go back to work, but I think it's 2 or 3GB? It ran Tiger just fine, but the networking with Windows computers is so much better and faster with Leopard that it made sense to upgrade (the G5 is on a network mostly populated by PCs). So.. we installed Leopard on it. Most of the time it will freeze a few minutes after bootup, even with a fresh install, and no programs added, just what comes with Leopard. The freeze is a strange one. The entire system just stops. Power is still fed to the mouse and keyboard, but neither function. It's just dead. So you have to force shut it off, and then turn it back on. Many times it will not boot up. Instead, the chime sounds, but the screen stays black, and the fans eventually go up to maximum. Again, upon reboot, it will freeze up a few minutes later. Sometimes it takes a while for it to freeze, and strangely enough if you're running a program, it might take a while for it to happen. But it does eventually stop running. It didn't do this under Tiger, so it has to be a software issue. But consider this... I reformatted the drive again, this time opting to zero-out all the data as well. A fresh install of Leopard seems to be fine. Then I run the software update. It freezes up before it finishes downloading all the updates. So... is it a Leopard issue? I can find that out by reinstalling Tiger, but won't have the chance to do that until Monday. But we would really love to have Leopard on it because of the improved networking. Or has something gone wrong with the hardware? I can't do a HW test because the original install discs that came with the G5 have gone missing. Before I installed Leopard for the second time, I looked at the error logs. Nothing seemed out of the ordinary, but maybe I just missed something. Another thing... it was fine for a while under Leopard. Then this started happening. I can't remember what might have caused it, but here are the additional programs we've installed on it: Adobe After Effects, Final Cut Studio 2, Flip4Mac WMV Studio, and Adobe Premiere Pro. Anyone else who has had this issue, have you come to a solution? PS. Does installing Bonjour on Windows really help with networking? Also, any reason why the G5 has issues with which LAN port it's connected to? There's 2 ports near the G5. One works fine. The other does not. But the MacBook Pros can work on both. Perhaps it's related to the freezing issue.