Yoga 2 13 brightness keys not working - it was TeamViewer monitor driver

Hello, I have two Yoga 2 13's - I think both the 59403750 model. Both have the same specs.
In one of those Yogas the brightness keys - "F11" and "F12" - do not work and it is full 100% brighness all the time. In the other (good) Yoga they seem to work OK - at least I can get the brighness down a few notches.
When I press and hold the Fn key to get F11 or F12 to work the *seem* to do what F11 or F12 would do normally - e.g. in a word processor or browser. So it seems maybe just the brighness function of those keys are not working.
Lenovo has calimed that this is not a hardware problem and they are not responsibile for it under warranty.
I have done a little reading some time ago and seen something similar that was maybe fixed by installing updated video drivers. Well, that did not work - as of a couple months ago. At the time I also updated the BIOS - again no luck.
Any ideas /inputs you might have are appreciated. Thank you.
Solved!
Go to Solution.

scf /scannow 'found corrupt files but was unable to fix some of them. Details are included in the CBS.Log' and then something about 'not normally suppoorted in offline servicing'.
I'm reading from MS Use the System File Checker tool to repair missing or corrupted system files and in the mean time I'm also doing a chkdsk /r just to make sure that's not an issue before I start trying to repair any files. Both were refirbs (still under warranty) - so who knows about the HDDs. Luckilly I may have the other one to pull files from if necessary - if it is something that easy.
It's been doing this since pretty much the day I got it. I've never seen it work right on this one.
I appreciate the tip to factory restore but that is always the last option IMHO. That's a lot of time for me to get this thing back the way I want it. There has to be a fix for this silliness - I'll keep working on it and write back when I know more. Thank you very much for the help. If you think of anything else let me know.

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