keyboard stopped working suddenly

[shellrung]

have pity, my son was on pc last night and keyboard worked fine, i turned on pc today and keyboard doesn't work. i checked connectins and they are fine, also rebooted with no luck. help  

[CBMatt]

You checked the connection, but did you disconnect the keyboard and then reconnect it?
Is it USB (flat rectangle at the end) or PS/2 (round at the end)?
Can you borrow another keyboard to try out on your computer?
Also, can you try your keyboard on another computer?  If so, does it still have problems?

The problem could simply be that your keyboard doesn't work anymore.  Thankfully, if that's the case, they're pretty cheap and easy to replace these days.

[soybean]

Might some liquid have been spilled on it?  That can ruin them if not immediately removed from the computer and thoroughly cleaned and dried, at least dried if it was just water.

[shellrung]

after a lot of searching last night, i found the problem. the power source for the whole room is controlled by the light switched. i turned off the light and when i booted back up the usb drivers needed to be uninstalled and reinstalled and that solved the problem. Thanks for all of your help - i got worried since this is my dad's computer and step ma would have skinned me a live had i "broke" it. Thanks again, this site has been and will continue to be my go to spot for questions!  

[CBMatt]

You may want to get an extension cord and plug your computer into another room that isn't controlled by a light switch.  This is trouble waiting to happen.  In any case, I'm glad you got it figured out, and you are of course welcome to come back anytime you have a problem.

[soybean]

after a lot of searching last night, i found the problem. the power source for the whole room is controlled by the light switched.

Are you sure that power switch controls all outlets in the room?  In some homes, one outlet in a room will be controlled by a switch and all other outlets are normal, i.e. have constant power.  So, if you did not actually test all outlets, you should.  It might save having to run a cord to another room.