[allmost]

I've had that happen with older keyboards, could be a few things. Could be dirty. Someone mentioned compressed air that might help. I've had success with some by taking them apart (if you feel like it and have a small phillips head handy) and cleaning the plastic sheet underneath the keys where the circuits run with alcohol. Coffee, lint, all kinds of stuff gets in there after a while....

[PSYCHO-FREEP]

Plasce keyboar under left frot wheel of Chevy Duramax, then back up and drive forward sevderal time, until keyboar cooperates.

[RightOnline]

“....where the circuits run with alcohol....”

Wow. Who knew.....