Hello wonder if anyone can help me with my tab sm-t800 it is stuck on the Samsung logo and does nothing want turn off or on i can not get it into recovery mode (power,volume,home)only thing you can do is to get it into download mode.I have tried to reflash it with the factory firmware which comes up as complete but it just goes straight back to the logo screen and stays there.I have tried all 4 firmwares for my tab s and say complete but all go back to the black and white samsung tab s logo screen and that's it.I have run out of ideas so any new ones will be helpful many thanks tim