HTC One M8 rear camera won't turn on

[AC Question]

The rear camera will not turn on. I click on the 4 dot icon and try to click on the rear camera but nothing happens. Only the Selfie camera turns on. Has anyone else encountered this problem? I reset the default in the camera settings but that didn't correct the issue.

 

[B. Diddy]

Boot into Safe Mode and see if it works: https://support.t-mobile.com/docs/DOC-10853