A problem emerged with my iMac some weeks ago. It would lock up sometimes when waking from sleep. The glowing light stops glowing, and I could hear the hard drive unpark itself, but then....nothing. After a few minutes of unresponsiveness, the fans will blow like a wind tunnel. All I can do at this point is hold down the power button to turn it off completely. What bothers me most about this is that it's leaving behind problems that Disk Utility cannot fix. So I tried to do a complete erase, reinstall of Tiger, and transfer of my Home directory. (That took forever because I found out after a whole day of futility that my external drive would lock up whole transferring files because it couldn't get enough power from the surge protector that my whole computing rig is plugged into. I had to plug the external into its own socket in the wall.) I thought I'd be fine after that, but the sleeping problems have reemerged, Disk Utility is finding problems (the latest check says this: Verifying volume Macintosh HD Checking HFS Plus volume. Checking Extents Overflow file. Checking Catalog file. Incorrect block count for file _CACHE_003_ (It should be (It should be instead of 125) Checking multi-linked files. Checking Catalog hierarchy. Checking Extended Attributes file. Checking volume bitmap. Checking volume bitmap. nformation.",0) The volume Macintosh HD needs to be repaired. Error: The underlying task reported failure on exit 1 HFS volume checked Volume needs repair I find it hard to believe that Firefox, a few widgets, Mail, Ecto, iCal, and iTunes would be able to stop my computer from sleeping after years of running smoothly. Is this a sign of impending failure? Could this be related to the surge protector not providing enough power to my external drive (which is usually off, in case anybody's wondering)? Should I just stop sleeping my computer? Should I put the last couple of months of Applecare to good use? Any help would be appreciated.