About a month ago I upgraded to a G5 tower from a TiBook, and I am very disapointed with its performance. It locks up frequently, particularly when I quit programs, fails to wake-up from sleep a lot, and won't eject discs or open the CD tray until I reboot the entire system. I've run the hardware test, everything came out fine, so I'm beginning to wonder if I just got a lemon. I actually just got the internet two days ago, so I had the computer for about a month before I had a chance to download the most recent updates, and it seems to be locking up a bit less, but it's still not nearly as stable as my tibook was. I'm running OSX 10.3.8 with a 1.8 GHz G5 and 512mb of ram. Can anyone think of anything I might try before I call up apple and ask them to exchange it?