HT4619 What is the hole under the power cord for?

Wondering how to turn my iMac back on after a power surge. Happened once before and was able to reset it by unplugging cord, holding down start button, then reattaching power cord and pressing the start button again. This only worked when I took it to the Mac outlet store though. When I try this, it doesn't work. Outlets and power source (aps) have power. Trying to avoid a trip with my 27" iMac to the store.
is the hole under the power cord a reset?
Thanks

Deborah,
Here are the specific steps for performing a SMC reset just so it's clear (note bolded bits):
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
Dave
P.S. If this doesn't work, repeat the process again only bypassing your APS conditioner completely this time using a standard AC wall outlet for testing/powering your mac. The APS unit may have an internal fault of some sort.

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HT4619 What is the hole under the power cord for?

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