This may be a little similar to this thread: http://forums.macrumors.com/showthread.php?t=994377 I have royally screwed up. I deleted some files that I think mustve been crucial because when I tried to start up my poor Mini (OSX 10.4.7) it goes to the grey page with the Apple logo and the thinking icon. After about a minute it restarts. And again, and again. I have tried: - Restarting it holding down the shift key (safe mode) - Restarting holding the X key - Restarting with the S key - Restarting with the option key - Reinstalling the start up disc (starting up with the disc in and holding down the C key) - Reset the PRAM Any words of wisdom for a complete and utter moron??