White screen after new LCD and restore

Hello,

I tried everything on my Iphone 3gs 16 gb 4.3.5.

My screen went white when I replaced my screen to my new backcover. The replacement went well but then it became white. (it's the second time for me, the first time I restored it with the power/homebutton method)

But now I used the power/homebutton method and it goes black after a couple of seconds, with no apple logo. So I connected my iphone to Itunes and I restored it. At the and the Iphone needs to reboot, it happened but my screen stays white! The wierd thing is that when I push the mutebutton down it vibrates.

The power button works and the home button works.

So my only option was to change my LCD screen, but after I replaced my new screen carefully it was white again.....??????

What can I do? please help me

Great thanks!