IMac turns off while sleeping

My iMac sometimes turns off during sleep mode, I did call apple care and went through utilities and the tech support said that issue should be resolved, but it happen again today. Has anyone else had the same issues? Is this also the start of some bigger issues down the line?
Thanks,
BC

HI BC,
Check System Preferences/Energy Saver. Click the Schedule button bottom right in that pane and make sure it's not set to turn off at a certain time.
According to this article, http://support.apple.com/kb/HT1237 Make sure your software is up to date.
Carolyn

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Why my mac turns off while sleeping ?

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Hi Hank,
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Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/ht1379
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http://support.apple.com/kb/HT3964
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but it is slightly different: (PMU REST = Shut computer down, disconnect power cord for 10+ seconds, reconnect power cord WHILE SIMULTANEOOUSLY PRESSING POWER BUTTON, let off power button for a few seconds, then press power button again to restart the mac mini.)
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...duct tape?
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shahzadfromlahore wrote:
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3.- I disconected the computer form the wall and wait for some minutes, and it did no do anything.
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Guitargirlcaz wrote:
I've checked with Apple. They only give 28Days warranty now :'(
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Regards.

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Not enough free storage space can slow your Mac down. Click your Apple menu icon top left in your screen. From the drop down menu click About This Mac > More Info > Storage. Make sure there's at least 15% free disk space.
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IMac turns off while sleeping

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