Powerbook G4. Erratic keyboard and mouse behaviour!

Hello
Had my Powerbook G4 for about 4 years now.
Recently the keyboard and trackpad have started behaving erratically. Sometimes the space bar doesn't work, sometimes it's the return key, sometimes the whole top line of the qwerty keyboard, sometimes all of these at once which makes the.
Often the mouse is frozen in the top left-hand corner of the finder page on start-up. Rebooting MANY times in a row very occasionally helps but generally doesn't.
I haven't spilt anything or dropped it. I'm guessing it's a software issue as it happens erratically.
I regularly repair disk permissions after every update. I run ClamX weekly and my virus count is zero.
Have tried resetting by pressing Ctrl, shift, option (alt) and holding on/off key for 10 secs but that doesn't seem to work, just ends up res-setting my clock!
Any thoughts/suggestions?
All contributions welcome...
Many thanks
Helen

Sorry, keyboard went a bit funny!
Meant to say that when they all go at once, it is extremely frustrating!!
Many thanks.
Helen
Powerbook G4 Titanium, 17", Mac OS X (10.3.x) OS X version 10.3.9; Processor - 1.5 GHz PowerPC; Memory - 512MB DDR SDRAM, Kernel - Darwin 7.9.0

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Powerbook G4. Erratic keyboard and mouse behaviour!

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