Faulty memory card?

I bought an extra 512mb of RAM (to add to the existing 256) when I purchased my computer (ibook G4, 14", 1.33GHz) just over 12 months ago. I have recently had problems with applications quitting unexpectedly. The hardware test CD reveals that only 256mb of this 512 card is being recognised. Is it a simple matter of replacing the old card with a new one or does it sound like a deeper problem?
thanks for any advice you can offer
Virginia
ibook G4   Mac OS X (10.3.9)  

It can still register in the system profiler if part of it is bad. Booting from the apple hardware test CD may help you find specific faults with the chip, but from my experience most companies replcae it without asking many questions. Running memtest (http://macupdate.com/info.php/id/14004)on it isn't a bad idea though.
Rember is a GUI for memtest, http://macupdate.com/info.php/id/15837

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