Putting songs onto my sansa 250

On your e250, go to the "Settings" menu, select "USB Mode", and set it to "MSC". Then connect your e250 to your computer. It show up under My Computer as a "removable disk". Right click on it and select "Format". Click on the "Start" button, making sure that Quick Format is NOT checked. Wait for the formatting to complete, unplug your e250, wait for it to reboot (or force it to reboot if necessary), plug it back in, and copy your songs back onto it.

Check and see if the songs you put on the mp3 player are a hidden file Connect to your computer open my computer goto tools on the top of the page folder options click on view Here you will see Hidden files and folder click on do not show hidden files and folders and put a check mark on hide ext....and hide protected Hit apply. Delete any songs you put on the player and start over

Hi,
You may need to update the firmware on the device. The data base on the device could be corrupt. Follow the instructions in the given link: Updating Sansa Clip's Firmware 

Go to My Computer and then look for the Sansa 250 icon there. If it doesn't show up, unplug the USB cord and plug it in again. Once you have the icon visible in My Computer, click on it twice and open it up. To load content, go to wherever you have MP3 files or whatever and use Windows Explorer to copy the content from your computer to the Sansa. You can also manage it through Real Player or other MP3 players (Media Monkey).

try plugging the device in the usb cable at the back of your computer

mormontazzy, plug in your sansa e200 then go to "my computer" on your computer find an icon that says sansa e 200(it might say sansa e250) click on it and go to a file that appears that says media then click on the songs file after that get all of your songs from itunes and drop them into this file if tat doesn't work then take all of your songs from itunes and dropping them into widows media player

Renew your music svc subscription from where you got those songs

"Refresh database" is a normal message that you will get everytime you unplug the Sansa from the computer - don't worry about that aspect.

If the songs that you have transferred have DRM encryption on them, they may not play right (or at all) on the Sansa.

If you have Windows Media Player 11, I would get the firmware update from the Sansa website AND format the Sansa inside Windows Media Player:
for the firmware,
for the format, http://www.sandisk.com/Retail/DriverDownloads.aspx
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 and get your player functioning normally.

-Tha Mp3 Doctor

I don't know about converting the MP3s to WMAs, but I had the same problem with "corrupt files."
What fixed that for me was instead of dragging and dropping files onto the Sansa, I synchronized them using Windows Media player, but only do 10-20 songs at a time, because if you try to do too many, they probably won't show up. I know it's tedious and annoying, but that's what did it for mine :) I hope this helps.

Check if the player is in Autodetect/MTP then try retransferring the songs on the player. And before unplugging the player from the computer check if the files are transferred to the player click on the sansa e200 player on the left window to check if it had really transfferred the songs to the player. If it still wont work, try trasnferring songs using windows media player.