Is my audiojack broken?

Hello,

I hope anyone can give me some information.

I replaced my girlfriends iphone 4 power button, the cable not the silver thing.

My first iphone repair :D

I did not removed the lcd so I was sure i would not break it while removing it.

But this had the consequence that i was able to unscrew the right screw that holds the lock button in place but i was not able to replace it.

So I did left out that screw.

Now my girlfriend says her iphone jack is not working anymore.

The iphone does not switch to headset when connected.

Can someone help me, did i damage a part or does the screw have any effect on it?

Thank you

(Sorry for the bad english)