Okay here's the deal. I got this Powermac G4 Sawtooth. When I got it it had a G4 450, DVD, 256MB, 27GB, Zip. When I got it I took out the old DVD drive and replaced it with a new CD. I added more memory to bump it up to 512. I took the old HDD out and replaced it with a new Segate 7200 rpm ATA 133 HDD. Finally I installed a fresh copy of Panther. Now down to the problem. My Mac keeps locking on me. I posted before and was told to take out the memory I added. I did that and it seemed to fix the problem. Then today while I was playing with iTunes and surfing the net BAM!!! it locked again. It froze colder than an ice cube and my iTunes sounded like and old 60's record with a bad skip. I'm about to give up, I don't know what else to try. The CD I installed was just a cheap PC style CD. I installed the new HDD but didn't upgrade the controller card. All the memory I put in it has been taken out with the exception of the 256MB chip that came wih it. When I installed Panther I did a custom install and took out all the extra language crap and didn't initialize the HDD with the Mac OS 9 drivers like it asks you too. It seems to like to die when I'm running iTunes but I've had it die while installing a printer and also while formatting zip disks too. Can anybody tell me what I'm doing wrong. I love my Mac but if I can't trust it its back to a PC... and I HATE windows so I'm open to any suggestions. Thanks in advance for all the help.