4GB on M2A-VM HDMI

I upgraded from 2GB to 4GB of DDR2-5300 and the SATA drives
disappeared! It's totally weird
since the the POST memory check finds no errors and the RHEL4 boot
image is loaded into
memory and begins to run. IOW, the drives are found, the GRUB
bootloader loads the data
from the drive partition but the O/S can't see the drive it was loaded
from?!
If I remove the extra 2x1GB sticks it has no problem. I thought it was
a problem with the memory
mapping and upgraded to the latest BIOS version but it didn't work.
Am I missing something obvious?

Thanks in advance!

Sudsy

.

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