ML350 G6 - Graphics Card Problem

Hello All,

I have a HP ML350 G6 which I am trying to add a Graphics Card to, but I am having hell getting it to detect it!

The 4 cards I have are:

GTS 450

GTX 650

Quadro 4000

GTX 680

All the cards are fine in the G6 APART from the Quadro card... which works fine in two other PCs. Initially I thought power but the 680 works fine which has simialar requirements.

I have checked in the BIOS and it doens't appear under PCI devices either.

I have run the latest SPP through so everything is at the latest version.

I am at a loss as to what to try next

Hopefully somone might have a suggestion!

Thanks in advance!