Second GPU does not show up in `lspci`

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http://unix.stackexchange.com – I switched the second GPU in one of our servers (Ubuntu 12.04.1 LTS). But now lspci only gives one entry: $lspci | grep -i nvidia 04:00.0 VGA compatible controller: NVIDIA Corporation G94 [Quadro FX 1800] (rev a1) I already executed sudo update-pciids and re-installed the nvidia dev driver. What other steps can I do? (HowTos)