|I've had that problem before as well when |
doing 2x256 + 1x512 , or,
when doing 2x256 + 2x512 also. This
usually occurs on cheaper motherboards
like eMachines and Compaq.
I've always been able to 'fix' it by moving
the modules around -- *not* pairing them
as one is instructed to do. And, even
better, I have always used Everest report
to "see" which of the four modules is
showing up as 'empty' to the BIOS.
You may need to reconfigure the layout a
couple of times, but you'll get it.