All the 4 leo and 2 tiger system drives I had before running are now unstable and hangs after asking the 1st task. So I decided to reinstall Tiger and Leo for every machine. I have 3 dual G4s, and all of them are avoiding Tiger and Leopard somehow. Tried with the DVD from the garden of Leopard restored to a partition using Panther Disk Utility and it hangs after the Leopard first message in the installer. Tried that drive on the MDD and the Sawtooth and hangs just as the system I had previously running. Other times it gave a kernel panic about IOKit. Tried with 2 DVD with 10.4.6 I had and it hangs after the selection of X11 as option or in the check of the DVD installer. Tried with the 4 CDs for tiger and after installing the 1st CD it never ask for the second. It install Panther and MacOS9 flawless. And the Panther install is really stable on same drives, just other partition. One G4 is a Sawtooth with 1.8 dual 7447 and also a MDD 867 dual, both with geforce 4 MX. The MDD has the latest firmware. --- Post Merged, Jan 11, 2018 --- The sawtooth has a M-Audio Audiophile 24/96 on it and were not pulled out. But the MDD is stock with no pci/airport upgrades. I even tried set-defaults on Open Firmware.