hi there
I have this keyboards that I got to clean for someone.I opened them and cleaned all the keys but apon closing them they no longer works even after rebooting countless times.What could have happened, are they dead or what?
They are compaq's keyboards. I'm one confused guy.

Tell me more about the keyboards? Did you just take the outer shell apart and dust around the parts that let the keys peek through, or did you open the "guts" of the keyboard and see the actual areas the keys contact? Did you spray anything inside the inner part?

Depending on what you did, or what you used to clean your keyboard, you may have damaged it beyond repair. Also depending on the type of keyboard you have, it could be a headache to get everything back into place. There maybe something against the inside membrane that is shorting making the keyboard think you have multiple stuck keys.

As far as keyboards go, I would never open one unless it is a last resort. Use a cloth, lightly dampened with a MILD cleaner to clean the keycaps. It you have a sticking key... pick the keyboard up... letters facing you... and tap the keyboard downward on a hard surface like a desktop. (use common sense for force needed and protect your keyboard and desk) That will send bits of trash to the bottom/front of the keyboard and out of the way of your keys.

relatively speaking... keyboards are inexpensive if you toast one. Pick up a new one at your favorite computer store.

Good luck

Rigel