Hi Darlene,
I noticed that you have received no replies to your topic, so I guess that this may be the sort of problem that is not encountered previously on the forums.
i have no detailed knowledge of the notebook computer concerned, but hopefully the following thoughts may help you to resolve the issue.
1 As its a new computer it may give a clue in the handbook (either paper or electronic) as to how to activate the keyboard backlight.
2 The vendor might have suggestions especially if they are fully up to speed with the technical specification of your notebook computer
3 Using a "System Restore Point" created well before the issue started is the next step…. this will set your computer's settings back in time to hopefully when the back light was working OK ( as you don't know when the backlight failed, you may have to try multiple System Restore Points until you get the correct one)…see link under 5 below.
4 As the operating system on a lot of new computers is Windows 8.1 it would be wise to ensure that the machine is fully updated both with both Windows Updates and also with Asus updates. after a reboot try the system again (you must remember to reboot) otherwise its likely the updates will not work. If you still have no joy then ….
5 Try "refreshing" your computer (this should not affect your data, but as always make sure your back up strategy is sound, comprehensive, tested/validated and covers everything that is on your computer that is important to you (especially product serial keys for your applications etc.,) Here's a link that provides details:
http://windows.microsoft.com/en-GB/windows-8/restore-refresh-reset-pc
6 It would also be informative to know if the backlight works Ok when booted into safe mode….. Here's a link:
http://www.7tutorials.com/5-ways-boot-safe-mode-windows-8-windows-81
7 An incorrect driver could be responsible so see if Windows has installed any likely suspect, perhaps via Windows update, and if so you could try uninstalling and rebooting and see if this helps… this could be a trifle time consuming especially if a lot of updates have been installed…!
If you still have no joy after trying this lot, it may be that there is a hardware fault in part of the keyboard back light system in which case its back to the vendor of the computer to fix it either under any provisions of the warranty, guarantee, service agreement or consumer statutory protection regulations that may be operative in your jurisdiction .
Regards
paws