Keyboard not illuminating?

Hello, I was using my macbook pro at night when I noticed that my keyboard wouldn't light up. I tried to manually turn on the keyboard illumination, but it didn't work. I look around and some said it was due to an update in the OS, and suggested to try using Lab Tick. However, this did not solve anything and my keyboard remains unlit. I had sent in my laptop a couple weeks ago due to harddrive problems. Is this a software based problem where it cannot send its command to the keyboard, or is this a hardware problem, possibly something happened when it was sent in for the harddrive repair? Your help would be truly appreciated, as I would not like to make another trip to the apple store, which would make my 6th appointment on problems with my macbook pro. Any kind of suggestion and/or advice would be awesome. Thanks

If LabTick cannot turn the keyboard backlight on, it is quite likely hardware. One way to rule out settings/software would be to create a new user account, log in as that user, and see if the problem persists. If so, looks like it's back to the Apple Store, unfortunately.

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