Not able to see the files in the usb ie SanDisk Sansa m230 MP3 Player .. can you tell me th solution for this .... i am even not able to listen the songs....

MP3 players can only play music files in mp3 file format. Music files need to be converted to mp3 file format before copying to the MP3 player. Please click on this link and follow my instruction to convert music files :-
http://www.fixya.com/support/r5798418-creating_transferring_mp3_music_files

Assuming the computer puts out enough juice, yes. Not all USB ports do.

Plug it in, and the Sansa should say "Charging" if it is charging. If it doesn't, try a different USB port if possible. If your computer has ports on the front/side and on the back, the back ones are more likely to put out sufficient power.

Try reflashing the firmware for your device you can find the latest firmware and flashing utilities from the manufacturer?s website. Make sure that you back your music up first because when you do this you are setting it back to factory settings. Then add music this way and see if it is works: 1. Free a USB port on your desktop computer. Now, grab the USB cable for your SanDisk Sansa MP3 player and connect the player to your computer. 2. Wait for your computer to find and recognize the player. This may take a few moments. Once you receive a confirmation message, open your computer and scan the icons for the SanDisk MP3 player. 3. Open the SanDisk Sansa MP3 player on your computer. The music files that you currently have saved to the player?s memory are displayed. 4. Open a folder containing music files that is stored in your desktop computer?s memory. Scan the files for songs that you want to transfer to the SanDisk Sansa MP3 player. 5. Left-click on a song file and drag to the SanDisk Sansa window. Drop the file and let your computer complete the transfer. The transferred file appears at the bottom of your music list. 6. Unplug your SanDisk Sansa player from your computer. Turn the player on and allow the file transfer to update to the internal memory of the MP3 player.

Check to make sure you stll have your driver for the player on your computer. If that does not work try reflashing the firmware for your device you can find the latest firmware and flashing utilities from the manufacturer?s website. Make sure that you back your music up first because when you do this you are setting it back to factory settings. After doing this if you still cant add music on your player try loading it this way: 1. Free a USB port on your desktop computer. Now, grab the USB cable for your SanDisk Sansa MP3 player and connect the player to your computer. 2. Wait for your computer to find and recognize the player. This may take a few moments. Once you receive a confirmation message, open your computer and scan the icons for the SanDisk MP3 player. 3. Open the SanDisk Sansa MP3 player on your computer. The music files that you currently have saved to the player?s memory are displayed. 4. Open a folder containing music files that is stored in your desktop computer?s memory. Scan the files for songs that you want to transfer to the SanDisk Sansa MP3 player. 5. Left-click on a song file and drag to the SanDisk Sansa window. Drop the file and let your computer complete the transfer. The transferred file appears at the bottom of your music list. 6. Unplug your SanDisk Sansa player from your computer. Turn the player on and allow the file transfer to update to the internal memory of the MP3 player.

You can reset the player by removing/reinserting your battery.
Here is alink to your user's manual:
http://www.sandisk.com/Assets/File/pdf/retail/Sansa_ug_Eng_m200.pdf

-Tha Mp3 doctor

have you tried opening the files in a music player? it sounds like you are just accessing the file folders. try opening it with windows media player or something like that.

It sounds like there is a problem with the firmware...call sandisk and have them do a firmware upgrade on the device...once you do that it should fix the problems you are having right [email protected]

If the files are not on the PC, Windows Media Player will not see them. You can manually manage the music from My Computer. Double-click on the device name Sansa m230 and you can see the files and folder. You can just drag and drop these onto your computer to save them. You might also want to format the device to remove everything and give you a clean slate. Right Click on Sansa m230 and select format. Best of Luck.

maybe the internal battery is shorted,leaked,low. i remove it and start working well.

your not using the correct program! you use windows media players. its most recommeded from sandisk. go to the sync section and on the side bar there'll be like a read snasa m30 right click on it clcik format media. then go to the sync section and drag the files u want in to the lil box and click sync