My display does not light up - what can I do?

I bought my Sansa Clip (1GB) in Minneapolis on business trip last Nov, but although button display lights up, menu doesn’t.

Device works (without menu backlight). I’ve updated to latest firmware, reset device and tried to turn backlight up to max display - no joy.

Is there a document/schematic which I can follow to work through all menus and sub-menus on my M340 device(1GB clip with FM radio)

Any help is appreciated

Sounds like time for a warranty replacement from SanDisk Customer Service, under the 1-year warranty …