As part of my weekend projects working on my 2x gaming computers, I'm also working on resurrecting my 20 yr old G4/400 AGP. It will power on, but the old 27 gb IDE hd doesn't appear to work.
I picked up a couple of cheap IDE to SD card adaptors from Amazon along with a pair of 64 mb 95 mB/s sd cards. In the process right now of installing OS X 10.4 on one of the cards, found my old 10.5 and 10.3 cd's as well, 10.5 failed to install it may require Intel, I'm sure I have my Public Beta through 10.2 media around somewhere to try in addition.
It didn't recognize the drive as an install target at first, discovered I had to open disk utility and repartition as Apple Partition map before it is a valid install target.
Planning on eventually working on my Mac IIci from 1989 and my PowerMac 8500 circa 1995, along with my 4x Mac laptops. But first my 2.4 gHz Core 2 duo Vista machine and my Athlon 64 800 will get XP and 2000 respectively.