New 27" iMac Brightness Control Missing
I have a brand new 27" iMac. Currently the only things plugged into it are the Apple-branded wireless keyboard and mouse that were included with the iMac and ethernet. I waited for the 10.9.2 update to see if that would resolve the issue, but it has not. I have also performed multiple PRAM and NVRAM resets.
The F1 and F2 keys on the Apple-branded keyboard do not decrease or increase the brightness of the internal display. In System preferences -> Display, there is no brightness slider at all. It is behaving as if I plugged in a generic 3rd party display.
I am about to copy over the
AppleBackligt.kext
AppleBacklightExpert.kext
AppleUSBDisplays.kext
from an identical 27" iMac (that doesn't have this issue) to see if that will resolve the issue.
Unfortunately, a complete reinstall of Mavericks is not an option at this time.
Thank you in advance for all your help and suggestions.
Edit: fixed title typo