Home Button Very Weird Problem :@

Hi, I have restored my iPhone 3Gs using DFU mode and the home button is working fine (also done a soft reset and the button works fine), but now when I use the phone properly in the iOS the home button does not work at all, so the home button only works when doing restores in DFU and soft resets, rather strange.

When doing restarts or putting the phone in DFU I never had the two prongs connected to the charge dock, is there a different circuit for restarts and DFU modes?

any ideas what it could be?

Thanks Chris

iOS 4.3.3