My sandisk wont cut off snadisk keeps flashing across the screen. And it says No songs.

Try resetting it:
1. Push the "Power" switch downward into the "Hold" position.
2. Press and hold the "Menu" and "Record" buttons at the same time until the device resets.
3. Push the "Power" switch upward all the way to turn it back on.
OR
1. Grab a steady hold around the device.
2. Push the "Power" upward and hold it there until it powers off.
3. Power the device back on by releasing the power switch and then pushing it upward again.
OR
1. Unscrew the screws on the back of the device (or simply push the lid off if it is a model without screws.)
2. Take out the batteries from the slot and wait until the screen goes black.
3. Insert the batteries the same way they were mounted and attached the lid again.
4. Push the power switch upward to turn on the device.

If That does not work try this:
-------------------------
Try reflashing the firmware for your device you can find the latest firmware and flashing utilities from the SanDisk website. Make sure that you back your music up first because when you do this you are setting it back to factory settings.