Thanks for suggestion.
Have been using one of 2 Keyboard Usb's for mouse. Left Option key does not work without mouse there either.
Fortunately the Control, Option and Command keys are duplicated to the right of the space bar on this thing.
Interesting about the = sign above numpad 8 is that it works in Lion but not Windows.
Maybe a strong jet of air - have to ask a friend who has electric portable compressor? that he uses to fill his tires with. It has a jet attachment for it which would be worth a try.
Reset Pram makes no difference.