Most of the keys are responding - not the shift/keys for example the @ key works from touching the shift key on the right side of the keyboard but not the left. The Pound and Dollar keys do not work at all.
Re: mx5000 keyboard - Not all the keys are responding
I had a similar problem after about 6 months of use with this combo. It didn't bother me for a long while then more keys started to go. What I did to fix it was. I took the keyboard apart and using tissue paper and rubbing alcohol I cleaned all the contact points on the thin sheet of plastic that makes it all work. Put it back together and it worked great, in fact it still works and this was over 4 years ago. I hope this helps. And remember don't be scared you can fix it.
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(FuNction key) A keyboard key that works like a shift key to activate a second function on a dual-purpose key. Commonly found on laptop keyboards, the Fn key is often used to control hardware functions such as screen brightness and speaker volume. The Fn key may also be found on extra small keyboards for desktop computers, typically for Page Up and Page Down, which are combined with Up Arrow and Down Arrow. See function key.
Make sure to run all available software updates as there's probably a firmware update for your keyboard you need to download.
If there isn't or the problem persists afterwards, you'll need to go into Apple Menu > System Preferences > Keyboard and Mouse > Keyboard and uncheck 'Use all F1, F2 etc. keys as standard function keys.'
1 . Look for Fn function key - Most laptops have this special key Fn that is next to the Ctrl key on the keyboard. It should have a blue or green color, easy to find.
2 . Look for F1 to F12 functions keys, they are on the top row of the keypad. Look for one has an icon that looks like the touch pad, which is to control the touch pad of your laptop. It maybe F8 or F9 depends on each make of your laptop. These function keys also control the brightness, sound, wireless etc.
3 . Now hold down the Fn key and the F10 key to enable the touch pad, in this example, the Toshiba laptops. You press them again to disable it
4 . If none of the above works, plug in an USB mouse, then check into the Control Panel -> touch pad or mouse configurations. Also, check Device Manager if the touch pad driver is installed and working properly.
You have a different keyboard layout. To swap around, go to control panel > regional and language settings > regional tab and from the dropdown menu select English (United States). If this was already selected, then select English (United Kingdom) instead.
The 8042 keyboard controller has been integrated into one chip with other I/O functions so I doubt you can replace it as a single IC and I'm afraid that is what has failed.
It is an extremely rare failure but I guess it has to happen some time.
The keyboard is kind of a polled matrix so it only takes the failure of a single line to bollix things up.
I think what you are talking about here is a motherboard exchange or repair.