Sansa Clip Plus not charging or powering on consistently

[Serenity]

I hope someone has had experience with this. I bought a Sansa Clip Plus off eBay.

If I let it sit a few days and press the power button, I'll get the Sansa logo and a "low battery" warning, and it will turn off. After that it's unresponsive until it sits a few more days.

When I connect it to a computer, Windows 7 recognized it once as having no valid filesystem, and after that it said it could not find drivers. Now the Sansa won't connect at all. My Windows 7 laptop also couldn't load drivers. I have the Sansa updater installed on the laptop from when I upgraded the OF on my Clip Zip before Rockboxing it.

When I plug the Sansa into a USB charger (5V, 2.1A) it does not respond and doesn't seem to charge, even when left to charge overnight.

I have re-soldered the battery wires--no change in behaviour.

If anyone has suggestions or knows any tricks, I would appreciate any help! Thanks!

[saratoga]

I'm assuming the disk that mounts without a file system has a weird size, like 32 MB or 1 GB?  You can try the unbrick directions for the AMS players on the wiki, but probably its just a dead player. 

[Serenity]

Ah! So the previous owner botched a firmware update? I'll take a look at the unbrick directions. Thanks for the information!