The left ear of my headphones does not play when plugged into my sansa c250 mp3 player, I thought it was the headphones, so I bought new ones and they don't work either, but both pairs work when plugged into my husbands sansa c250

Try updating the firmware.

http://kb.sandisk.com/app/answers/detail/a_id/156/kw/firmware/r_id/101834

I have the same problem as well. you just have to take the headphones out, and not put them in all the way. just put them in partway, wait until you can hear out of both.

buy new ones or plug it into something else and see if it is working. you can also wiggle the jack at the end and see if that'll work or go into music settings see if it can play the music or see if music player is turned all the way up.

for a new pair of sansa headphones you have to buy a new mp3, they dont sell just headphones.

WHAT DID YOU DO TO SOLYA YOUR PROBLM

Your MP3 file might not have any content on the right channel. Try another Mp3 file. If the problem occurs on another file check the hardware:
Unplug the headphones from the mp3 player. Try another set of headphones. If the problem occurs with another set of headphones, it is a broken player. If using another set of headphones cures the problem, try your original headphones again. Plug your original headphones back in. If the problem comes back, buy a new set of headphones.

have you tried reloading the files? sometimes this works for me.

Yes thats what you need and i am sure they have them at radioshack...

That happened to me. It is fixable, but you need to open the caseing of the mp3 player itself. what hapened was that one of the dongles connecting the jack to the main chipset lost connection. you probably bent the headphone thing too much and it released.

to open the sansa, you must take out the battery. then you should find 2 black screws near the edge of the casing. Unscrew them and take off the black plastic cover. You should see the bottom is now totally silver. Near the headphone jack there should be another screw, Unscrew it. These are the only screwes you will need to unscrew from now. Next, Pry off the screen cover to reveal the chipset. Remove the connection from the chipset to the button pad. Take a standard screwdriver and carefully pry out the chipset, revealing the headphone jack. Be sure that the 3 dongles hooking it up to the chipset are in place. Put some tape on however you like, just be sure its tight, and be sure it doesnt interfere with any of the side buttons. Then add some more tape underneith the dongle for more support (do this unless you have a sodder, then sodder the dongles back on. Put the chipset back in the casing and replace the faceplate (dont forget to connect the button pad back to the chipset), and replace the back thing. Put the battery back in and test it. If it doesnt work then add a little tin foil into the back on the dongle. It should work.

I recently purchased a Sansa e280 and in three weeks of regular use it developed a similar problem, with music cutting out from playing in stereo to mono, coming out of one headphone speaker. Sandisk tech support told me to reformat the device and install the latest firmware, which I did, but the problem continued and occured more frequently. I have returned the player back to the seller and I shall not be getting another one. A nice Ipod alternative from Sandisk, but from what I have seen written about in forums, the Sansa e200 series appears to be buggey with problems.