OK, I've checked this out pretty throughly, and I am not sure where to go next... I came home for lunch today, and found my Mac Mini G4 with the fan running, and a blank screen. It was obviously locked up. System has 10.5.2 with all of the latest updates. This is not my primary system, I have an MBP for that. Here is what I did: Force a power off/on, and I get the normal gray screen with the Apple, and spinning gear, but it never stops spinning. Force another power off/on, and I get to the Apple screen but no gear. Force another power off/on and reset PRAM for three chimes. Still get to Apple and no gear. Force another power off/on and if I wait long enough I get a folder with a "?" indicating that it can't find the boot volume (Starting to look like a disk issue) Boot off my retail Leopard Disk and I get the same thing - Apple logo and no gear. I hear the DVD spinning, but no drive access noises. I didn't think about holding down the "C" key to force it to boot from the DVD... Thats all I had time for at lunch today... My next thought is to: Try Leopard DVD again, this time holding down the "C" key Try the hardware CD that came with the Mini... Try Firewire Target disk mode with my MBP... Try my retail Tiger DVD... I thought about opening it up and reseating the memory DIMM. I did upgrade to 1G back in September(?) when Leopard came out. If I can get in from an OS X DVD, I can run disk utility and see what is available. Maybe I have some disk corruption, or maybe I have it needs a new drive. Any other thoughts or suggestions?