My keyboard suddenly flips to symbols intermittently - help !

my keyboard has suddenly started to flip to some kind of symbols font intermittently - help !   I've tried another keyboard, and the same thing happens. (I'm typing this on another computer)  I've tried opening variuos system preferences, and choosing default settings wherever possible. Sometimes it flips back and forth rapidly between the weird symbols and english... almost like there's a short circuit or something.  My Wacom tablet works fine... Thanks in advance for any advice ! 

Try these two resets, if that doesn't do it start in Safe Mode and see if the problem persists.
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
The 5 second timing is important to a successful reset.
PRAM RESET
Zap the PRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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