Just to share an experience.
I was at the beach (in the shade) trying to use my iPad and it appeared to be busted. The screen was black - I tried power off/on, etc. nothing - the screen remained black. I was disgusted and dejected but thankful that I had the protection plan.
When I got home, I decided to try it once more - viola - it workerd perfectly.
After much retacing of steps (and asking if anyone had dropped the iPad), I realized what it could have been! I ran to my car and got my sunglasses and put the on - bam - it was "busted" again.
My sunglasses are polarized!! No matter what how I oriented the iPad, no light was coming through - MORAL - Beware the dreaded polarised sunglasses and the iPad!