[Q] Can't start Camera, Can't start Gallery, Google Play has stopped topic

Hi
I use my nexus 7 only to play games and not rooted.
Suddenly camera has stopped. When I open gallery it said "No external storage available" and google play has stopped.
When I press Power + volume down to get screenshot, it said "Couldn't capture screenshot"
When I connect it to PC, there is no folder in the internal storage

I already tried several os, 4.3 4.4.2 4.4.4, all the same
When upgraded to 5.0.2, it only stuck at 4 colored dot animation
Now it is on 4.3 rooted, i managed to install rootbrowser via adb and no SDCard folder

Any suggestion ?

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