Specific keyboard(s) stopped working

My keyboard randomly started to freak out the other day. Originally I thought it was mouse related due to the webpage (Reddit) I was on was just zooming in so big that I couldn't read anything. It stopped doing that, and then I woke up to it acting like a key was pressed down. In particular, I looked at the calendar and it was zooming past the months. The keyboard also doesn't work at boot up, and has num lock enabled at boot for what it's worth. I actually have two of these keyboards (Microsoft Ergonomic 4000) and neither of them will work now. The one hadn't even been used yet. They both light up, and I've tried them on a ps/2 converter without luck. I'm now using a different USB keyboard that works both in USB and ps/2. I've tried uninstalling and re-installing the software for it multiple times now and still cannot get it to work.

I did notice this oddity under devices and printers. It is showing the mouse as a keyboard in the picture and lists it as keyboard;mouse. The mouse I have is a gaming mouse with multiple buttons on the side, so maybe it makes sense, but I've included a picture of what I'm talking about. I've also tried uninstalling the mouse but the keyboard still won't work.

 

I gave up on this issue soon after I tried your suggestion, David. Eight months later and I still cannot fix it. The keyboard is detected, drivers do get installed, it is visible in devices and printers. I've checked the bios to see if legacy support is enabled; it is. I tried uninstalling a previous windows update as suggested elsewhere but no luck. I really don't know what it could be and every time I think about it or try to fix it, it drives me nuts. I'd really rather be using my ergo than any flat keyboard.

 

Could it need a cleaning, I know mine is about due. Takes about an hour, keep you camera handy and do not turn the key board right side up the will fall out that takes 30 min to get squared away!!!

 

Well, as I said, I have two of these keyboards, one of which has never been used (just tested as a replacement when the original one stopped working) so I doubt that.

 

Turn it upside down and give it couple of good taps, never can tell if something got in amongst the keys.