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If certain keys on your keyboard work but others don't, you may have a case of keyboard crud. (Yes, that's the technical term.) Keyboard crud is made up of sandwich particles, bits of chocolates, and Coke splatters — among other things. To decrud your keyboard, follow these steps:
Flip the keyboard over and give it a moderate shake.
This will cause any big chunks to fall out.
Give the key in question a blast with can of compressed air — no liquids, please! If the problem continues, remove the key with a key-cap puller — a doohickey you can find at any good computer store.
Clean the key with denatured alcohol and a foam swab, and give the space beneath the key a good blast of compressed air.
If nothing seems to work and several of your keys are bad, you could have a permanently damaged keyboard. If so, buying a new one is really your only option. Repairs to keyboards are rarely worth the time, expense, and inconvenience.
And, of course, if none of the keys work, be sure to check out the USB port just to make sure that the keyboard hasn't come unplugged.
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