Changed the back case but now no sound or signal

I have just changed the back case on my iphone 3g i have followed guides on how to do this and then done the reverse to put it back together but now when i turn the phone on i get no signal and no sounds. If you plug headphones in you can hear music etc. Anyone know what i can do?

This is a user forum not a technical one, so unfortunately there probably won't be anybody here who has dissassembled an iPhone.
One could only guess that if it is a loose connection, that the no signal could be caused by an antenna not being connected properly, and the speaker issue being related to the cable for the speaker. Due to all the small parts though there could easily have been some damaged caused during reassembly or disassembly.

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