I just got a Mini that is about 6 months old but I had used it and it works fine. I reinstalled Tiger on it and it booted fine. I then ran all the updates, including the .10 combo update. I restarted and the progress wheel ran for a while and the restarted itself. That was normal enough. After that first self restart, the progress wheel spun for about 15 minutes. I turned it off and tried to boot in safe mode and it did the same thing. So, now it won't start at all; I just get the white screen with a perpetual progress wheel. Any suggestions