ORAC,
That link is the incorrect motherboard. LDG_GEAR _MONITOR has the A7N8X Deluxe which comes in two different chipsets. You have to look on the PCB between the second and third PCI Slots to tell which revision the motherboard is.
Rev. 1.03, 1.04, and 1.06 are the nForce2 400 Chipset.
Rev. 2.00 and higher are the nForce2 Ultra400 Chipset.
A7N8X Deluxe motherboard Rev 1.04 and higher will work with the 2600+ without needing a BIOS revision. If the motherboard Rev is 1.03 and the BIOS as never been updated, then it will need a BIOS will need to be updated.
I am still leaning towards a RAM issue though. Here is the list of Approved nForce RAM:
nForceTM Memory Compatibility
Take Care,
Richard
P.S. Here is the link for the BIOS:
A7N8X DELUXE