I wanted to at least try installing Leopard on it(not server, as I don't have it yet). I stuck a clean hard drive it it, but the optical drive seems a bit "touchy" as it kicked out my Leopard disk and refused to boot from it. I keep a burned "working" copy to save wear and tear on my original-it gave me the same result with both the burned disk and the pressed disk. I thought I'd try to make a Leopard install flash drive. I used my saved Leopard image and a(new) 16gb flash drive. I formatted the flash drive as HFS+, APM and then used the "restore" function in Disk Utility to "burn" the image to the USB drive. I did all this from my MBP running OS X 10.9.5 For all intents and purposes, on a booted system, it appears to be a fully functional 10.5 install disk. When the flash drive plugged into a system, it mounts and brings the auto-start dialog box-just as if I'd put a CD in the drive. I was able to force the Xserve to boot from USB using OF, but when it attempts to boot off the USB it just gives me a big stop sign(gray circle with a slash through it). Any thoughts on what could be going on? Could the fact that I "burned" the flash drive from 10.9 be the problem? If so, I can try doing it on a PPC computer from 10.5.