Background Backlight

Background Backlight

What could be wrong with my Nokia 6600?

I was talking the other day and the screen just went black. I thought it might have just switched off, because it run out of battery or something, but when i tried to turn it on again, the screen went white, the backlight was on, but nothing else appeared. The phone boots, I can actually insert my pin, the nokia logo works (though i can only hear it, nothing appears on the screen), and, as far as i can tell, the whole phone works except nothing is displayed, i can actually use it to call somebody, but nothing appears on the screen, except a white background, and the backlight. what's wrong with it?
i tried reseting it as advised, but it still doesn't work.

You either perform the hard format .......

press [Green]+[def3]+[*+] during a power on performs a hard format : this will return the phone like you have received; make sure to have full battery charged !
--[green]/ [send] key

You flash your phone (take it to a techician) or bring it to me