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Message: [QUOTE="dstan, post: 651084, member: 9655"] I am running a Macbook. I installed OS X a few days ago. Since then I am having a problem waking up the mac after it goes to sleep, not always but more often than not. When I open Mac the grey screen is there, I press a key, which before always woke the Mac up. Now it will not wake up, I have to power off and power up again and I get the message "you shut down because of a problem". Other times I try to wake it and there is a small grey box that follows the arrow around blotting out the screen as it goes but I can sometimes type in my password and it will wake up. Previously never had to enter password to wake up. Is there a setting that has been changed? dstan [/QUOTE]