[fvultee]

Just to rule out possible other causes...

I had the exact same symptoms, and it turns out a board was loose in the base of the phone (the half that has the keyboard). No screen backlight, though I could hear rings, pick up the phone, etc. In my case if I pressed on the connectors where the power or headset jacks are, the screen would magically come on. Called Verizon and they overnighted me a new phone. If you get these issues again, you can see if this is the problem by pressing a headset or the power plug firmly into the base and see if the screen magically appears.