Sleep problem with my iMac
I am having a strange problem with my 2009 iMac running Mountain Lion with latest update installed. After I put it to sleep it wakes up every couple of minutes (I can hear the fan and the hard drive start up, but the monitor doesn't come on) and then it goes back to sleep. It does this over and over again as long as it is in sleep mode. Does anyone have any idea what is causing this? I don't want to have to shut it completely down after each use but I don't think the extra wear and tear on the computer would be good for it. Any help appreciated.
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