Hi Mac the Knife,
Thanks for the comprehensive and very informative reply. The 1 gig module that has been installed in the offending A60 is the one you have detailed in your post. This was the module suggested by the Crucial web site after it had analysed the machine.
Regarding my Nephew's A60 it was purchased in the same shop and at the same time as my daughter's and his is still operating without any difficulty.
She updated the Bios but this has not helped either. The original 180MB module is not accessible without completely dismantling the machine or I would try it with the 1 gig module on its own.
Anyway she will let Crucial know the outcome of the Memtest tomorrow so it will be interesting to hear what they have to say.
Rgds
Willby