The iMac won't turn on
If an iMac will not power on, do a System Management Controller (SMC) reset:
Unplug the power cord.
Wait fifteen seconds.
Attach the power cord.
Wait five seconds, then press the power button to turn on the computer.
If an iMac will not power on, do a System Management Controller (SMC) reset:
Unplug the power cord.
Wait fifteen seconds.
Attach the power cord.
Wait five seconds, then press the power button to turn on the computer.