POST failed when plug in PCI-E 8X network adapter
We recently purchased 4 Optiplex 7050 Mini Towers and 4 QLogic 57810 Dual Port 10Gb Direct Attach/SFP+ adapters. After I installed the Qlogic network adapter to the PCI-E x16 slot, POST failed when power on. The power light flash in yellow but no video output. I tried to use other PCI-E 8X card but the same result. A PCI-E 4x data acquisition card works find in both PCI-E slots (16x and 4x).
It seems the system considered the net network adapter as video card and thus no video output from build-in video card. Also, failed to check and init hardware.
Please correct me if I am wrong and could you advise any possible solutions such changing BIOS setup?