Workstation wont recognise new RAM

[sevros1981]

Hi people,

Got a HP xw9300 machine with 2 X dual core processors that we use for some video editing and graphics work. Up until this week we had been getting by with 2GB of RAM, which is arranged in the slots in 4 x 512MB sticks. The new RAM I have purchased is the correct speed and spec, as recommended by HP, but in 2 x 1GB sticks. No matter what arrangement i try with different pairs in different number slots, I cant get the machine to recognise any more than 2GB RAM. Any ideas why??

The machine has ATI radeon graphics cards and matrox video cards if this helps.

[sevros1981]

stballs.

forgot about that - think they have about 1.5 GB between them which might explain it.

[sevros1981]

so.... anyone have any ideas why my bios and system information both say I only have 2GB when I have 4 inside the machine?