When on the setup screen keys on the keyboard work
What do you mean not working? Is it that certain keys don't work, or the whole keyboard does not work?
Maybe your keyboard has been hijacked by a virus. Have you tried booting up in Safe Mode to see if it works?
Turn off the computer, then hit the power buttonto turn it back on and immediately start hitting the F8 key repeatedly untilyou see SAFE MODE. Take the Safe Mode option and let it boot up. SafeMode will look different to you, the screen will be darker and the iconsbigger, this is normal
SOURCE: keyboard not working at all
Keyboard is definitely bad and will need to be replaced but try one more thing just to be sure.
GO into the BIOS by pressing F2 on your external keyboard. In the BIOS, there is an option in there to reset to factory defaults after you do that save changes and exit but after you completely exit, unhook the external keyboard and see if your laptop keyboard works. If not then you know for sure without a doubt the laptop keyboard needs to be replaced.
SOURCE: acer 5920 keyboard setup
there is a software that launch menager. the program controls the keys you talked bout. you need to remove LAUNCh MENAGER.
SOURCE: How do you use the green keys on an LG R500 laptop keyboard?
I had a similar problem, kept getting french accented letters such as è, ç,à,é when i pressed keys like ", / , \ .... Anyways to solve the problem i pressed ctrl and then shift.
it switched back after pressing this a couple times.
Good luck!
SOURCE: Toshiba Potege R500 - neither control key works
I had same problem with CTRL keys not working.
Removed base cover, re seated keyboard connector & all worked OK.
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