Type input and command key functions don't work

I have regularly been experiencing problems with the type cursor not moving and not inputing type while using the keyboard. Also while this occurs command key shortcuts and the force quit dialog box won't appear on the screen after pressing the command, option and escape keys. The only temporary solution I have at the moment is choosing restart from the Apple menu.
Any suggestions or help with this would be appreciated!
iMac Intel Mac OS X (10.4.4)

You might try repair and maintenance, which Dr. Smoke goes into detail here:
http://www.thexlab.com/faqs/faqs.html
I've had keyboard problems that I fixed by running repairs.
You could also have a bad keyboard. If it's a non-Apple keyboard make sure you have the most up to date software for it. If you happen to have a spare keyboard plug that in and see if it happens with a different one.

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Type input and command key functions don't work

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