Your Studios do not turn on or seem to charge because the wires on your circuit board in your right ear have loosened or broke, due to improper jack or charger insertion. Fold your left ear, unclip your right ear cushion, then unscrew the 3 screws which are on the plastic part of the headphone not the alluminium part. You will see several dry joints on a small circuit board. 3 or 2 wires should be broken, one to send power to your right ear which should be gold and red. or either a black or red wire for your battery. bottom line, solder them back