Phone won't turn on!

[AC Question]

I finally caved and installed the system update for my Galaxy S3 and now no matter what I do, my phone will not turn back on. It keeps vibrating and showing the black screen that says Samsung Galaxy S3.

 

[RumoredNow]

Did you have any of the following on the phone: root, custom recovery, custom kernel or Xposed Framework?

Any of those will bork an automatic OTA update.