It worked once then It stopped when I unplugged it from the computer

Never unplug the computer. To switch it of,press the on / off button for 4 or 5 seconds, it then will power down, as it should and first save all important data. When you unplug, you will damage the data needed to start up again, without trouble. When switching on again the computer gives messages, follow these, so it can try to recover the lost data.

HELLO!!

may be a relay went and if not a switch . then a gain it could have something to do with the computer !!!!!

Have a shop look at it, there is a power relay that either is causing this or something right around it is, seen this about five times over the last ten years in Hitachi sets. I had one customer who had it connected to a wall switch and from time to time had to unpower it several times but once on it was fine.....

Very cool

ok so i called 1-866-sandisk and she told me how to fix it. you just flip the key lock at the top so you see orange, then hold down the record button. then you should get some sort of message on the screen. then you plug it in and under my computer a file should show up. you open it and make a folder in it called sansa.fwm (i think thats the right folder name, if not, try sansa.tmp or email me). then you unplug it and it should say formatting or something like that. once its done it should work.

Here's what another user did - let me know if it works:
ok so i called 1-866-sandisk and she told me how to fix it. you just flip the key lock at the top so you see orange, then hold down the record button. then you should get some sort of message on the screen. then you plug it in and under my computer a file should show up. you open it and make a folder in it called sansa.fwm (i think thats the right folder name, if not, try sansa.tmp or email me). then you unplug it and it should say formatting or something like that. once its done it should work.

I would recommend checking the batteries make sure that they aren't dead. If the batteries aren't dead and you are still having trouble might just be a defective one. I personally love mine. I have a dell E310 with win xp and it works great. I just download the songs onto my computer. Then plug the usb wire into the computer and move the songs to the K drive is what mine comes up.. For a shortcut once you see the drive appear you can create a shortcut to the drive by dropping the drive to the desktop. So it is alot easier to move the songs onto the drive. I simply just drag the song over the shortcut I created and it goes directly on. Just make sure that when you are finished adding all the songs, you click the scissors (safely remove hardware icon) on the bottom right of the taskbar and click stop for that drive, or else the songs you put on won't save. Once it says you are free to remove the drive simply unplug usb. Then plug in your earpiece and hit play on mp3. You should hear the song.

I use limewire to get my songs, but whatever site you use should be fine.

I've had similar problems. You should reformat the player and install latest firmware from Sansa. (See below)

(There is an option to format the player w/o installing new firmware. Copy an empty file named sansa.fmt on the 16mb drive and unplug usb. The player formats and restarts. This is an unofficial solution that solved my problems, since my Sansa got totally stuck and would not accept the procedure below.)

New firmware: download the latest firmware .exe file from Sansa site
Once you have downloaded the file, please follow these instructions.
1) Double click on My Computer so that you can see it on your screen.
2) Turn the player off.
3) On the top of the player is a Hold switch, move it to the right (toward the headphone jack) so you see Orange.
4) On the left hand side of the player is a Record button, press and hold it while connecting the player to the computer. Continue holding the Record button until you see a new icon under My Computer called 16MB FORMAT. Once you see that icon you may release the Record button.
5) Double click the file you downloaded earlier and run it. Follow all of the on-screen instructions, and when you get to the prompt where it asks you whether you would like to Format it, choose Yes. Once it is done, click Finish.
6) Disconnect the player and look at the screen. Several things will be displayed, and when you see Key Lock, System Shutdown, move the Hold switch on the top back to the left.
7) Turn the player on and watch the screen. If you see a Refresh Database Fail error, you will need to follow steps 1-7 again until you do not get the error. If it does not work the first time, it could take up to 3 times for it to work.

good luck /Par, Stockholm, Sweden

If you get the MTP on your screen and your trying to sync it with your computer just press and hold the usb/mtp button and your computer will reconize it [=

When you put songs on your mp3 player don't put them in folders if you do.

Also did your mp3 player come with any software, you may need to use the software in order to put songs on.

When you've finished putting songs on do your safely remove your mp3 player from the computer, if not that could be your problem.

Also it could be anything from a small read error, try formating your mp3 player which may fix this problem to do so follow these steps below:

First connect your mp3 player to the computer, once you've done that go to "Start" - "My Computer" - now look for something called "Removable Disk" which is your mp3 player, once you've found it "Right-click" on it then click "Format", once format as complete put music back on your mp3 player, then see if the problems been fixed.

Good luck. Hope my solution was helpful in some way. Further problems, leave a comment on here and i will get back to you a.s.a.p.