iMac shuts down once a week on its own

iMac shuts down once a week on its own I have found the past 4 weeks that my iMac will not respond to any mouse movement, keyboard, trackpad or pushing the power button every 5 days or so. I must unplug from the wall, replug into wall then push power button, then it boots up. [...]

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Source: http://www.xdadroid.com/2010/12/10/imac-shuts-down-once-a-week-on-its-own/