I still have this white screen.
I got the same problem with my 3GS for 2 days already.
I watched so many videos and tutorials to try to fix it but it still doesn't work. I tried the DFU mode (10 seconds on both buttons and then switch it on again), I tried to re-plug the screen nape and also to unplug the main-board from power during 1 hour (even more). I still have this white screen.
Do you guys have other ideas for fixing this?
Is this a good question?