SANSA E250 IS NOT RECOGNISED

Solve your MP3 Player Connection Problem.
Check out this tip it will tell you what is going on.

No drivers for it -only for video. Have you tried drag and drop?
Here's a site with some helpful tips:

http://www.ccrane.com/MerchandiseSupport.aspx?ProdEdp=12832

Sorry, it doesn't work that way. You can use a separate card reader to put files onto the microSD card. When the card is installed into the Sansa, the Sansa will see the additional music.

I do mine through Windows Media Player
1)Plug in Sansa
2)Open up Windows Media Player and wait for the Sansa e250 icon to show up under the library. First time, might say 'What device is this' or 'Autoplay'-for autoplay,you click 'sync media files to Sansa e250 using WIndows Media Player'
3)When library shows, click 'Sync' if it is not already there.
4)Just simply click and drag the songs you want from the computer library to the list pane on the side.
5)Once your done, click 'Sart sync'

TO DELETE
1)Plug in
2)Wait for the icon under Library in WIndows Media Player
3)Go to Songs under Sansa e250
4)Right click desired songs and choose Delete. You only want to delete from Sansa e250-nothing else

~loli~

you connect it to the computer then go to my computer

then find the sansa and right click then press format

Try this. Go to settings, reset all. connect to computer, when the popup displays, select view files. all should be there. I had the same problem today and that solution worked for me.
Bill
Sansa e250

These are the most common methods for recovering Sandisk's Sansa Mp3 Players. I have been almost universally successful in recovering Sansa players using one or a combination of these methods. These methods do not work if you are having synchronization or music format issues - they are for recovering a player that will not power up, freezes, flashes, is not recognized by the computer, and a host of other issues.

Reset the Sansa Player first. On most models, restart is done by holding the power button in for 15 seconds or longer. Check your specific manual to be sure. The manuals are available from the Sansa website if they have been misplaced.
Download the Sansa Recovery Tool from the Sansa website.
Format - Erases Everything: Connect your Sansa player to the computer and open Windows Media Player. Click on the Sync tab. Pull down the drop down menu underneath the Sync tab by moving your cursor over the Sync tab and left clicking on the little black arrow underneath the Sync tab. Highlight "Sansa 1GB" (wording may vary slightly), and then select "Format." - this should erase everything.
Firmware Upgrade- Erases Everything: Get the latest firmware upgrade from Sansa - it updates the firmware and erases every song in the player all at once. Note: this method doesn't work if already have the latest firmware. Go to this website and click "Firmware Updater" to find out:http://www.sandisk.com/DriverDownload/driverList.asp
If these fail, then:
Try this: disconnect the player from the computer, turn it off, hold in the volume + button, and reconnect the player to the computer while holding the volume + button in. Keep holding the volume + button for an additional 5-50 seconds. Windows should eventually go into recovery mode and revive the player- it will pop up a window that says Found New Hardware Wizard.
If you get the problem where MTP Device keeps popping up continuously, uninstall the “MTP Device” by going to Start à Control Panel àSystem à Hardware à Device Manager (you computer may vary slightly, depending on Windows Version).
You may have to restart your computer after each of these methods to get them to work properly. Disconnect your Sansa player BEFORE shutting down your computer.
-Tha Mp3 Doctor

you have to reformat the player

i had the same problem.  the solution i used was to unscrew the back and pop the battery out and put it back in.  the only other option is to wait for the battery to die, which can take a while.  it's definitely a flaw with the sansa.  its happened twice within 6 months...  good luck

Th device may be too full. You need at least 6MB for each GB of music on the device to create the "database" or GUI. Delete a few song, restart the device. Best of Luck.