Does anyone have any ideas on how to fix the sticky, semi-functional keyboard on my imac?

It's the original, Apple Pro Keyboard w/scissors keys that came with the imac, but I didn't start using it until about a year ago when my clacky, durable Macsense couldn't get the job done. It was slipped wrapped closed in my closet, thus unused. I have often thought of getting a new keyboard, but this keyboard would be okay if it were not for the space bar. l have to press it extra hard with my thumb, harder than the other keys just to get it to work. Doesn't have much of a spring to it.

In recent weeks, due to a severe increase in chronic low back and leg pain, I can not sit at all. Standing is okay for a while, until my legs, knees and feet get tired.

Only thing I tried is compressed air. And googling.

Last edited by deniro; 09/21/14 08:32 PM.