Yeah, With mine it does not even get power from the usb I dont think as the player still shows just a black screen when connected to the pc unless I turn it off for a bit. The battery indicator shows a full battery but its clear to see that it's not. I have bought 2 of these mp4 players and I think the same thing is happening to the 2nd one aswell. I've made a post on this forum that further explains my problem.
http://www.mympxplayer.org/viewtopic.php?p=20222#20222 and also got a link there to the player that I bought off ebay. Is it the same one you have?