HELP! My iMac won't boot any more. Just got done playing a game under XP and boot camp and went to reboot as usual. At first everything looks fine. Get the Apple logo and the spinning gear below it. Then, the gear keeps on spinning and eventually the Apple logo is replaced by a circle with a slash. So far I've tried: - booting from original DVD and running Disk Utility and Repair Disk - booting into diagnostics and running the extended test overnight, no trouble found - booting from original DVD and running Disk Utility and then Repair Permissions, so problems were found and corrected I can still hold down the Option key and boot into Windows. Something about the Mac OS must be corrupted. Any ideas on what I can do to fix this without doing an Archive and Install from the original disk? My system is a 20" aluminum iMac running 10.5.6.