Chances are is that it's a UEFI thing with the graphics card and the old BIOS on the xw6400 doesn't know how to see it so it thinks there is no video card.
If the LEDs are flashing 6 times and then pausing, then that is the problem.
Newer BIOS can be told to see Legacy (pre-uefi) hardware, but old units cannot be made to see newer hardware.
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Re: Some questions about a xw6400 workstation
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