crwdns2934241:0crwdne2934241:0 Joel Mooke

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My iMac runs for few seconds and shutdown

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The iMac runs for few seconds, shows the apple logo and progress bar before shutdown but when I disconnect the the display it  does not shutdown or it runs for about 5 min with no display before shutting down

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iMac Intel 20" EMC 2105 and 2118

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open