I would try forcing the MSC connection and reinstalling the Sansa firmware.
Go to this link: http://forums.sandisk.com/t5/Fuze/Sansa-Fuze-Firmware-Update-01-02-31-amp-02-03-33/td-p/139175 and download both All Regions links. You’ll have to try each one if you don’t know what version of hardware your Fuze is. Unzip them into different folders and you’ll have FuzeA.bin for version 1 and version 2.
Version 1 and Version 2 are for different pieces of hardware. One is not an update of the other.
Turn the unit off. Slide down the power button to click into Hold position–you’ll see an orange dot. Open Windows Explorer (My Computer or Computer), connect the USB to the computer. Hold down the << side of the wheel and connect the USB to the Fuze.
With luck it will pop up two drives in Windows Explorer. Drag FuzeA.bin onto the driveletter for Sansa Fuze. (Might as well try version 1 first.) Disconnect and see if it installs the firmware. If not, try the other version.
