Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
iPhone 5 Part Leaked before launch
One reseller has managed to get a picture of another iPhone 5 part. The photo is of a iPhone 5 proximity light sensor flex cable. iFixit’s Kyle Wiens noted that the corresponding iPhone 4 part. contains the power button, noise cancelling mic and proximity/ambient light sensors. The new iPhone 5 part doesn’t contain the microphone, so this might suggest it is placed elsewhere.
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