Screen doesn't auto turn round

[shaunyboi_91]

I recently replaced the housing because of the dents and scratches on my old one with one a purchased off ebay, i used an htc universal assembly manual but when i completed changing the fascia and booted the device again i went to turn the screen round (to pda mode) and the screen didn't automatically turn itself round like it used to. This wasn't due to going slow as soon as you change the screen round and tap start menu it reacts normally.
Could this be because of the way the coaxile cable was put back? thanks.

[clemsyn]

I think there is a magnet somewhere to recognize the screen to turn around when you put in on PDA mode..I could be wrong.