Blank White Screen - No Menu Showing
My Sansa has a similar problem. Sometimes when the Sansa turns on (after the Sandisk logo) the screen will either turn black, blue, or black and white stripes. The player still works, but it is hard to navigate without the screen, obviously.
What I end up doing is letting the backlight turn off and then pressing any button. Sometimes when the screen comes back, the display is allright again. But sometimes it takes more than a few tries. Turning it off and on again seems to work a little better, but it is more time consuming.