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Is an Infrared Sensor necessary?

Is installing the infrared sensor necessary for my 15" MBP to function? Would unseen processees be affected? I don't use an apple remote at all. And where would this infrared sensor be hiding if it were installed?

thanks-mike

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It's part of the hard drive cable.

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Mike McIntosh crwdns2934231:0crwdne2934231:0
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