Sometimes after putting my iMac to sleep, I can't get it to wake up and have to turn it off at the mains. Any ideas why?

Sometimes after putting my iMac to sleep, I cannot get it to wake up again. It's as if it's shut down and I have to turn it off at the mains and restart it.  Any ideas why? Does this keep happening to anybody else?

That message means that you have to restore the iPad now. Something went wrong. You need to restore the iOS software and then restore from the backup.
Read this carefully and follow the instructions. Make sure that you restore from your backup at the end of the process. That is covered at the bottom of the support article.
http://support.apple.com/kb/HT1414

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