I'm having trouble sending email again, so excuse me if replies are absent.
The screen of my laptop is also on the blink - a loose wire suspected. The guy at Dell technical support was trying to talk me through removing the keyboard with a screwdriver. I didn't know that was allowed? It seems a bit radical, like doing a spot of amateur surgery on a tendon or something. I had to go to my neighbour's to borrow the right size of screwdriver. By the time I came back, the Dell techie help man had clocked off and I was left alone to tinker. I was quite pleased when I put it back together with a few satisfying clicks and snaps.
It's still touchy though. I am tip toe-ing around my keyboard, trying not to offend it.