camera to the iMac does not work, you must start

Got an iMac 27 inches by the end of 2012. Lately the built-in camera will stop working. If I restart it, it works fine. And it continues to work properly. I think that something is happening when he sleeps all night, or for a long time during the day. I called the Japan Apple here, and they had me to do that thing where you hold Option, command and... P and R? There is a name for it, but I forgot. I'm going to call Apple again, but if anyone has some smart ideas for me, I'm all ears. Thanks in advance.

Reset the SMC and see if that helps, you can also reset the PRAM. Instructions for both are in the iMac Intel SCM and reset the PRAM

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