3,7v it's the minimum value to switch on...if this is the value after full charge (about 2/3 hours in "on" switch position) than player have charge problem!!
4,2v is the full charge battery value !!!
if when you try to switch on, nothing appened than try to clean switch:
you must open the player and spray it with a stupic cleaner (protect display before).
i had a player that show mw always "low battery" and then switc off...with a dump upload all works well!!
if you want to make a dump please save your personal dump with follow instructions:
http://www.mympxplayer.org/how-to-ex...tool-vt66.html
explain better what players do when try to switch on :?
Bye