HELP HELP HELP!!!! TABLET PROBLEM... HELP!!!?

I NEED HELP RIGHT NOW!!! I was using my brother's samsung galaxy TAB... i was playing a game on it and it was getting glitch, so i tried turning it off and on again, and it didn't turn back on and the screen was black but i could still hear the music from the game i was playing, IF IT HELPS IT WAS CHARGING WHEN THIS HAPPENED!!! i pressed the on/off button like five times but nothing happened, i unplugged it from charging and pressed the on/off button a couple more times... but the music stopped and now nothing is happening when i do anything!!!!!!!!!!!!!!!!!!!!!!!!!!!! PLEASE HELP ONCE AGAIN I WAS ON HIS SAMSUNG GALEXY TABLET!!! :'((((((((( he will be home any minute noe HELP!!!!