Sorry if this is the wrong forum to post this... My dad has a 20" PPC Mac desktop with 512MB RAM. Today we wanted to do some work on iDVD, and when we started it up, I saw that there were a number of updates we didn't do for a while, 14 total. So I update them....took a long time, but eventually I get to restart the comp and it starts installing. It stalls at about 15% for roughly 30 mins; I wanted to leave it, but a power outage hit and the thing went black. Now when I try to turn it back on, it gets stuck on the grey Apple screen and won't start up. I looked around and tried restarting in Safe Mode by holding shift, but nothing. Anyone have any advice?