Stuck on Boot Screen

I have tried everything including trying to unlock bootloader to flashing new firmware but my nexus 7 is stuck on the boot screen. I have tried various methods described on XDA but nothing is working. is my hardware the problem. My nexus just switched off while watching a movie and now stuck on google logo. Everytime I try to do something this appears:
E:failed to mount /cache (Invalid argument)
E:can't mount /cache/recovery/log
E:can't open /cache/recovery/log
E:failed to mount /cache (Invalid argument)
E:can't mount /cache/recovery/last_log
E:can't open /cache/recovery/last_log
E:failed to mount /cache (Invalid argument)
E:can't mount /cache/recovery/last_install
E:can't open /cache/recovery/last_install
E:failed closing /dev/block/platform/msm_sdcc.1/by-(I/O error)
E:failed to mount /cache (Invalid argument)