Recently I disassembled my Unicomp to clean behind the keycaps; remove the keycaps and the keys, shook out and used canned air to remove any debris that was on the plastic case, then reassembled the keys. This was done while the keyboard was unplugged from the computer. Currently, about 1/3 of the keys do not validate input when pressed. The "click" is still present, however no letters, numbers, or symbols are present on any word document.
Strangely enough, pressing Shift and then the key will allow the key to work. No driver or software was installed or removed during the cleaning process. I'm completely at a loss for what the problem is