White screen of death!
I'm having the same problem, like in this topic: White screen after repair
When I power it on, I never get the apple logo, and it goes right to a white screen. If I hit the power/lock button it will go black screen. Hit it again and white screen. The mute toggle works (phone will vibrate), and iTunes recognizes the iPhone just fine. Holding home button will bring up voice control. I have tried a new LCD and digitizer's, and same symptoms.
I have restored the firmware twice using iOS 4.1 and 4.2.1, but keeps same white screen