Well thats why you try the restore, then if that fails you know for sure it's hardware related
Some people have had success with just a clean restore. I have had this happen before and a restore resolved the greyed out wifi. But it's different for everyone.
Well I'm sending the phone into apple cuz the power button has stopped working...maybe the new one will be ready to go
*edit*
Just a thought...what if the iPhone I receive has the same issue? Send it into apple again? Will there be a fix for this issue?
Sent from my iPod touch using ModMyi