668      iPhone_iPad_Mac_apple

I having iMac 27" 2009 that prafect machine but...

iMac 27" 2009

if the system will show no signs of powering check the cables and try a different outlet.

disconnect all external devices except OEM mouse and keyboaerd

reset the smc

https://support.apple.com/en-us/HT201295

repeat two or three times

if the system reboots use the diagnostic disks that came with your computer at the time of purchase

最後更新：2017-09-09 01:18:56

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