Board fitted with 4 sticks of 256mb total 1024
but bios and computer only show 512 whats up???

1. removed motherboard and all the bits from one case
and fitted in a new one, same harddisk and proc etc but new graphics card.
2. fitted in a new case started up computer the had to re-activate.
3. now compter only see 512mb
4 Asus P4T-E with rambus memory