Mac Mini Shutting off during boot

Hello Everyone - hope I can get some help on this..
I've got an Intel-based Mac Mini, which suddenly (after changing the video resolution - at least that's the last thing I did before this changed), boots to the Apple logo, with the spinning logo underneath.. This then spins for about 30 seconds (normal time), and then the Mac Mini shuts off..
I've reset the SMC and PMU, but no joy..
Help!
Thanks in advance!
SB

Did a full reinstall of Leopard - that seems to have fixed the issue.. A smidge draconian, but effective nonetheless...

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