Newbie here so welcome to all.

Just upgraded my pc and have a problem with the memory. Problem is as follows.

Motherboard has 4 ddr2 memory slots (red x2 yellowx2) When I install 2 matched modules in either of the red/yell slots ststem won't boot, cant even get into bios. Fiting one module in any of the slots system boots no problem so proving that both mem modules are working o.k.

I am running win xp pro sp2 all updates done. 5.1 Build 2600

System as follows.

Gigabyte GA-MA78G-DS3H
Bios Award Modular V6.00pg
CPU AMD Athlon 64x2 dual core 5200+ MMX 3D Now (2 cpu's)~2.7GHz 1mb total l2 cache 65w
Memory Corsair value select DDR2 667MHz 2x2GB
On board graphics ATI Radion HD 3200 Display memory 700.0 mb
Realtek on board audio
Direct x 9.0c
Maxtor 250gb S/Sata2 7200rpm 8mb cache sata 300
chipset AMD 780G
550 w psu

Any help/advice would be welome.

John