I picked this one up yesterday. The stock 4gb hard drive was dead, as was the CD-ROM drive. Fortunately, I had a spare Apple CD-ROM drive, and tossed in a 40gb that came from one of the G4 towers I upgraded. I had some "teething pains" and was never able to get a successful install of OS9, but do have it working now with OS X 10.2(which also has its own quirks, as it must be installed in the first partition of the drive, and that partition can be no larger than 8gb). I'm going to try again with OS9, as I honestly prefer it to the earlier versions of OSX and I think it's a better match for the capabilities of this system. Upgrading the ram was also fun. It only had the stock 32mb, which is nowhere near enough to run OSX. The design of this computer requires that all ram modules be "low profile", so I dug through my PC66/100/133 box and came up with a 128mb and 256mb low profile module to give me a total of 418mb. This is my first time playing with an old-world ROM Mac, so it was fun to "get my hands dirty" and get it running again(even if it is a bit cosmetically challenged). I also have a 7100/66, but haven't yet successfully been able to get it to boot. It gives me an error about halfway through booting into Mac OS(I'm not even sure which version) I suspect that it may need a new PMU battery, as I understand that a dead one can wreak havoc on these older computers, but haven't gotten too deeply into playing with it. I may also try a clean install of OS 8.5 or OS 9.0 to see if that gets it going.