Mac Mini Intel Core 2 Duo 1.83GHz, no hardware changes since purhcased, a year and 4 months ago. OS 10.5.6. I come back to the office and it's frozen. When I try to restart, it gets stuck on the grey apple screen (no wheel underneath either). I did the following: Disconnected all peripherals Reset PRAM Reset SMU (I even tried the PMU reset, which results in the fan spinning at max speed) Holding the option key correctly invokes boot disk options, but no choice works (as explained next) Tried booting up from DVD Tried booting up from external firewire drive Set it in target mode and verified via firewire that the internal drive is working fine (I checked it with Disk Utility with no errors found and even booted up from it). In this mode even the DVD in the Mini's drive showed up on the other computer's desktop and it's perfectly bootable Reseated the RAM Replaced the RAM Booting in single-user mode ends up here: http://nucircle.com/mini.JPG Tried to restore firmware, but no-go (DVD spins up but no progress) Disconnected internal HD to force other boot-up disks to engage Tried another power supply from an identical model Re-applied 10.5.6 update in target mode Ran hardware test - everything checks out fine Before I contemplate more drastic measure (like retiring it), is there anything I haven't done? I appreciate any help.