The Lock Button isnt working?

Hi All,

I continue on my iPhone build and I fix one part and seem to break another.

After stripping it all down I then put it all back together but now my lock button doesnt work.

Any ideas?

I followed the tutorial and the rest of the buttons on the ribbon all work the volume, the headphone jack and the vibrate.

Could I of damaged the lock button?

If so how?

What do I now need to do?

What could of happened?

Thanks.