Mach Speed 1GB MP3/MP4 Player stopped working.The screen went blank after i upload a video to it from my pc.?

I REPLUG IT TO THE USB BUT THE USB DOES NOT EVEN RECKONISE IT.IT WONT TURN ON OR OFF.IT DOES NOT EVEN RECKONISE IT'S CHARGER.PLEASE TELL ME WHAT I CAN DO TO FIX IT.THANK YOU