intel iMac won't reboot
I unplugged my iMac while it was running, not it won't reboot.
Unplugged the power cord, waited fifteen seconds, reattached power cord, waited five seconds, then pressed power button. Nothing!
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Why would you unplug the computer when it was running and where did you unplug it from, the back of the computer or the walls? Either way, you can try a SMC and PRAM reset, however if these don't work you likely damaged something and need to take it in for service at your local Apple Authorized Service Provider.