Mac acting as if the apple key is stuck down+ pram reset not working

My Mac pro has started acting as if the apple key is held down! Menus and cursers are all wrong or not working at all. Rebooting cures it for a few hours but sometimes only a few minutes, I've tried swapping keyboards ( twice ) and using diffrent usb sockets without any joy so I'm starting to think it's a system problem. One suggestion I read was to reset the pram but even that won't work. Holding down the command / option / P / R combo at start up doesn't do anything.
HELP!  PLEASE

Boot off your *original* Install Disk while holding down the *d key*, (not c key), then run the extended Apple Hardware Test. Some disks require you to use the Option key at bootup to select AHT. Some Discs have it inexplicably on Disc #2. Some models have a separate AHT CD.
The Memory test can really only be trusted if it finds a problem, not if it doesn't find a problem.
Memtest OS X...
http://www.memtestosx.org/joomla/index.php
Rember is a freeware GUI for the memtest ...
http://tech.kateva.org/2005/10/rember-freeware-memory-test-utility.html
Have you blown the dust out lately?
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
iStat Menus...
http://bjango.com/mac/istatmenus/
And/or iStat Pro...
http://www.islayer.com/apps/istatpro/

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