Ok i have searched the the forum and none seem to directly apply to my issue so ill post this and hope its not a repost. I have the 2014 edition and i picked up my tablet off the table yesterday and noticed some icons greyed out. I went into settings/storage and noticed the sd was not mounted which was odd so i clicked mount and nothing happened and i realized it said insert sd. I took the card out and put the card from my phone in and it didnt recognize that one either. I put the card from the tablet in my phone and it worked instantly. I have formatted the tablet installed the stock rom, installed cleanrom. Nothing seems to work. Obviously my warranty is void and as i can find no apparent way to untrip the knox counter (go to hell samsung with that stupid efuse crap) anyone have any other ideas to repair this thing. It has no been dropped or anything that i can recall nor water or anything of that nature it just decide to stop working i imagine. thanks in advance.