I just added a second 80GB 7200RPM MDD to help speed it up a tad, but when I booted into my Tiger install on the original 60GB HDD I had some issues formating the drive. It kept throwing me errors saying it couldn't unmount the drive and even said my password was wrong a few times (I don't even have a password on this machine). So I figured I'd reboot it into target disk mode and format the drive via firewire 800 on my PowerBook. It booted to TDM but shown no display and only mounted the 60GB drive. I rebooted the MDD to go back into Tiger and try again from there, but no video. This MDD does have a dead PRAM battery, but I've never ran into this before. The PowerBook G4 I'm typing this on also has a dead PRAM battery and has never had an issue not showing the display on boot.