Apple wired keyboard A1242 - spacebar doesn't work
I've blasted it with air, still won't work. Any suggestions how to remove the spacebar to clean it inside?
The newer keyboards are sealed and can repaired.
Test the keyboard with another Mac. If the spacebar doesn't work there either, then you need to replace the keyboard.
FWIW, you can use most any generic USB keyboard and some generic wireless keyboards with your iMac.