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I have fairly new HP server: ProLiant ML150G6. On board video only supports low resolutions. Installed NVIDIA GeForce 210 (required a DVI-VGA adapter for my ViewSonic monitor).

Card works great, but since I installed the card, the onboard networking has stopped functioning: Tried with two different cables, verified as working, and booted both to Windows 2003 server and Ubuntu 12.04 - always the same result: "network disconnected" although the green light in the machine and the light on the router indicate that there is a physical connection. Seems the video card has created a problem with the onboard networking.

What's wrong? How do I fix this?

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If you take the network cable out of the server and plug it into another computer, what does it say? –  mxl_ Oct 7 '13 at 1:45
    
@mxl_ - appreciated, but please read the question carefully before commenting. :-) –  Vector Oct 7 '13 at 1:51
    
I did. I was suggesting you test another machine on the same connection; your question does not make it unequivocally clear that you have, just that you have tested the cables and that the connection worked before on the server. –  mxl_ Oct 7 '13 at 2:02
    
This is a bit of a stretch as an explanation, but here's the theory: the specs (h18004.www1.hp.com/products/quickspecs/ds_00148/ds_00148.pdf) say the network is "Embedded HP NC107i PCI Express Gigabit Server Adapter"...some motherboards share PCIe lanes...when you plug in a GPU it turns off the lane doing the networking. I'd need to know a lot more about the motherboard architecture to know if this is even plausible though. –  Ash Oct 7 '13 at 2:14
    
@Ash - I don't think it's that much of a stretch. That's the sort of thing I smell. When it happened, it reminded me of the IRQ conflicts of ancient times... :-) –  Vector Oct 7 '13 at 2:25

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