Tecra A4 recognize only 512MB of memory

I added 512MB DDR RAM, in addition to the original 512MB, but the laptop doesn't recognise the full 1GB, only 512MB. Both modules work - new is recommended module from Crucial.
Any ideas?

Hi
I know this sounds strange but it seems both modules are not compatible together!
The Tecra A4 can be definitely upgraded up to 2GB (2x 1024MB) memory.
I find out that Toshiba recommends using these modules:
PC2700 512MB (PA3312U-2M51)
PC2700 1024MB (PA3313U-2M1G)
I found also this website which provides compatible and supported modules for a Tecra A4
http://www.orcalogic.co.uk/asp/prodtype.asp?prodtype=11719&ft=m&st=3
It seems you can use a 200-Pin PC2700 (333Mhz) DDR SODIMM modules and I would really recommend using the same modules i.e from the same vendor.

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