Tab Pro 8.4 Dead, no light no response

If the tablet does not respond and no longer detectable in download mode for Odin , the serviceman may realize that we have disabled KNOX ?
I set to work with Trickster processor mode "ondemand" and video mode "performance".
After i played Real Racing 3 for 30 min, tablet remained connected to the source and do not respond to any buttons after an interval of a few minutes.
NOTHING!!!! NADA!!!!