Hi all, We have just replaced a cracked screen in a 2 day old macbook pro for a user (he dragged it off the desk with a security cable!) and since then there is no brightness control in the display settings panel and the F2-F3 keys don't work either. We have reinstalled a fresh OS and boot camp. The brightness keys work fine in bootcamp (XP) but not under OS X (10.4.10 currently). Does anyone have any idea whats going on? The original screen was a Samsung and the replacement is a Chi Mei brand (both are used by apple) I did note that you are supposed to use different Display rear housings for the different brand screens. Any clue here? All we can think of is that it needs a particular firmware or somthing to recognise the different screen. Does anyone know how to force a reload of a firmware? Otherwise the Macbook pro is showing no signs of its mishap! Thanks for any help.