I am getting a white screen of death on my iphone 3g 8gb after taking it apart and replacing the dock connector and headphone cable...I've tried restoring in DFU & recovery mode - just brings it back to white screen or else stuck on apple logo- what else can I do (hard reset makes no difference) pleaseeeeee?!

I've been at this for 4 days and desperately want my iphone back!
Have I damaged some hardware? Can I get away with just replacing the lcd digitiser??

ANY help is really REALLY appreciated!!!!