27-Inch iMac Won't Power On Intermittently

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i have mid-2010 imac that's been great desktop design on whole. problem whether starts unreliable. i've tried whole "reset smc" trick doesn't seem affect likelihood comes on. once machine on, works perfectly; i've never had crash, faults or wonky behavior, don't think it's logic board or ram. power supply? appreciated. thanks!

- john
 



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