Sandisk MP3 player SDMX1 - bad headphone connector

the jack inside the unit either is bad or the solder connections are bad...you can re-solder the jack(if you know how to solder) and see if this fixes it...or else you'll have to replace the jack(which may be avail. through Radio Shack)

Try the manufacturer's driver download wizard at http://www.sandisk.com/sandisk-support/driver-download-wizard

just find firmware and off device trun on hold button and press +and update ur mp3 firmware ok

dont know what "hall" is, and im guessing the battery isnt dead---might need to format it

This unsually indicates a bad connection with the jack. Not the headphone jack, but the connector on the player. My son had that issue so I ended up opening the unit up and resoldering the connector to the circuit board. Don't recommend doing that. You'll need to have a technician do that or if it's still under warranty take it in.

Dirt inside of the headphone jack can be the culprit. If you have canned air, you can blow it out, or twist the headphone connector inside the jack to clean the contacts.

Press far right button (play/stop) and hold it down for about 3-4 seconds. Now press A--B button (3rd button from right) and audio play shows on the screen. Press this button one more time and FM radio shows on the screen. Then press far right button and FM can now be tuned in. You can also download the instructions from www.sandisk.com

First go to www.sandisk.com and download the instructions for this particular mp3 player. I'm guessing it's the SDMX1. Look for this model and get the instructions. They're about 30 plus pages. Volume is adjusted very easily-Look at your SDMX1 with the data screen to your right and headphone plug to the right.
1.find the joystick control-it sticks up and is chrome plated.
2.imagine it is a compass with North-up
3.simply move the joystick North for louder volume and South for lower volume.
4.you can also read the volume numbers on the screen in the right lower quadrant. they go from 1-40. Good luck.
If you ever have headphone problems with sound from only one earphone, let me know. I know how to fix this better than new! Also, if the play-on/off switch becomes hard to operate, this fix is also very simple.

did you try different headphones?

I hope I can help you since so much time has passed. This is a rather common problem with the SDMX1 and that is because the headphone jack was installed with too little solder. Here is what you do.
1. Dismantle the player by removing 3 screws ( 2 at one end and 1 at the other).
2.Carefully pry the end caps away.they should pop off.
3.lift the upper half of the case from the joystick end gently.
4.lift the entire circuitboard out. watch where the battery terminals are.
5.look at the headphone jack where it is installed on the smaller circuitboard.
6.on both left and right sides of the jack down on the circuitboard you will see 2 solder connections.
7.these are for the left and right channels.
8.if you look carefully (you might need a magnifying glass), you will probably see a very small break in the connection.
9.using a pointed soldering iron (no soldering gun here!), simply resolder BOTH connections using a very small amount to solder. This will most likely solve your problem.
10.put everything back together and it's as good as new. VERY EASY.