Unexpected restarts
What causes my desktop to occasionally restart on its own? This has started recently and at totally random hours.
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Best reply
Check the power cord to make sure that it is firmly plugged into both the back of the iMac and the outlet.
Go to Apple > System Preferences > Energy Saver and un-check "Restart automatically after a power failure" then test it that way for a time to see if it stays off instead of restarts.
If you are using a Surge Protector or APC, replace the surge protector and/or have the APC tested for a bad or weak battery.
If you are having other electrical issues in your home or office, please call a certified electrician to out check your electric service.
If the problem points to the iMac, then you will need to make a service appointment for your iMac.