Keyboard letter/number keys not working; Function keys OK

The function keys on my Bluetooth AND USB keyboard work, but none of the letters or numbers work, so I can't log-in in the appropriate field. I can move the icon with the mouse, (Bluetooth or USB) I've tried 2 keyboards, one USB the other Bluetooth, but I can't get past the log-in screen cos the letters & numbers don't respond. I can adjust the brightness using F1 & F2, and I can adjust the volume with F11 & F12.
Luckily I have this MacBook Air!
It started off as a hardware issue where I couldn't even start up. Also I can't get a hardware test to run to completion (you know, switch on whilst pressing D). Strange that the D key works for this! Also it seems Option/Command/R/P sometimes works for a reset paramter RAM (PRAM); (sounds like a baby should be in there! ;-)). So the R & P work at Startup; therefore plus D key, but beyond, nothing. My log-in includes lower case r or d.
Beyond that letters/numbers do not work.
I have since tried a Safe Boot where you press the Shift key as soon as the start-up sound is heard. And since then I've not even got to the log-in screen! What's going on? It's like there's a 2013 phenomenon.
Any ideas anyone?
Jonathan

Do 2-3 SMC resets, doing just one does not always work. If the resets fail then try another keyboard and if those keys work then you know the original keyboard needs to be replaced. Follow the directions in:
Intel iMac SMC and PRAM resets

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Message was edited by: Fernbergjim

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Message was edited by: JumpingJehosaphat

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Keyboard letter/number keys not working; Function keys OK

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