My rca m4208gr-b wont come on or take a charge

como borrar una cancion en mi mp3

try pressing the reset button

Sounds like there is likely a firmware issue. Try downloading the firmware update from here:
http://voxrightnow.custhelp.com/app/answers/detail/a_id/2558

Follow the instructions describing how to perform the firmware install.

Note: Be sure to back up any important media you have on your player before starting the reinstall of the firmware.

Manual for RCA Opal M4208GR:
http://www.voxxsupport.com/images/manuals/M4208GR/media/M4208GR_DOC_OM.pdf

This player has default setup MSC mode, seeing the player as a flash drive also called a removable disk.
MSC = Mass Storage Class
When seeing the player as a removable disk in Windows Explorer:
Drag and drop the song, with mp3 or wma format, into the Music folder on the player.
Note: some wma files may have DRM = Digital Rights Management. These files might be copied or transferred onto the player but cannot be started for playback.
Important: in MSC mode always safely remove hardware, the players' removable disk, at the bottom right corner of the task bar.

Transfers to the player can also be done with software like Windows Media Player 11, RCA easyRip or other software from music stores.
This can be done in MTP mode. MTP = Media Transfer Protocol.
How to switch to MTP mode, seeing the player as Media device:
In the players Menu go to Settings. Go to Protocol. Select MTP mode / switch from MSC mode to MTP mode.

Try this:
http://voxrightnow.custhelp.com/app/answers/detail/a_id/2200

My model M4208 RCA MP3 player will not charge. If it is the battery, how do I change it and where can I get one

try another set of headphones, well, not on the player, if its on the max then its maxed out. but basically if you connect it to speaker you can turn the speakers volume up even more.

might be bad headfones?

I did the same thing and reformatted mine too! If you go to www.rcaaudiovideo.com and put in your model number M4208GR and click on the update for the firmware update again then it will put everything back on the MP3 player. I know it sounds nuts but it worked for me and it wont do anymore harm then you have already done ;) Give it a try. Hope it works for you like it did me!

Plug your RCA M4208GR-B MP3 player into your computer with the USB cord. After the computer recognizes it.
STEP 1 click start
STEP 2 click MY COMPUTER
STEP 3 Right click the associated drive letter (i.e. OPAL) to show the option menu.
STEP 4 click "install RCA easy rip"

Unplug the RCA from the computer. Uninstall all RCA software and then reinstall it. Then replug the RCA into the computer.

If that fails, try using the volume + instead of the menu button.

-Tha Mp3 Doctor