The PSU went on my G4 MDD dual 1.25ghz power pc. http://www.everymac.com/systems/appl...25_dp_mdd.html It has Ultra ATA drives. Rather than just replace it, I chose to pick up cheaply a G5 dual 2.0ghz (PCI version) Power PC tower. http://www.everymac.com/systems/appl....0_dp_pci.html I even found some ram cheaply and can max it out. This G5 uses SATA drives. My issue is: all my data and installed software is on two drives in the previous computer, the G4 I listed above. I would like to just install those hard drives and start up on the G5, with the OS, application and data, etc, just a faster computer. Is there a way to adapt the ultra ATA to SATA within the G5 tower? Thanks so much for any replies.