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

It is currently unavaible for reinstall, due to the time (albeit short) required. If I can't fix this another way, that's the route I'd like to take. I'm just hoping I can find a more direct solution, and to find out if this issue is just this machine or broader.
The steps I plan on taking right now are,
Verify the display is properly set up by Apple (maybe the internal USB isn't plugged in right?)
Replace .kext files listed above from an identical iMac with working brightness.
Dump any preferences related to the display I can find.
Reset NV/PRAM again.
Reinstall the OS.
Replace.

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