It won´t start at all or it starts and works reeeeeeally slowly at first. Like the processor would work million times slower, almost like just hangs jammed. Sometimes after hours of trying to get it started, it will start and work normally again for a long time. But when I shut it off or put it to sleep, again it´s nearly impossible to get it started again. The Disk Utility said, that there´s an hard drive error "invalid sibling link". I booted from the OS X installation CD and did the repair, but it said it couldn´t repair it. Then I did this fix: http://www.macosxhints.com/article.php?story=20070204093925888 But again it said the same error. Then I booted normally and checked the Verify Disk again and to my suprise it is now saying the hard drive is OK... ...BUT it still has the same problem! It just is having really difficult time waking up.