Can you try setting the nic speed to 1gb in the OS and see if it allows it to connect?
Hi, I have purchased some time back a Dell PE m1000e with 3 x M710HD, 2 x M620 and 11 x M610. All the blades are connecting to the network except the 2 x M620. Both have 2 embedded qlogic 10gb ports and 1 mezzanine NIC card 10gb ethernet with 2 ports. I upgraded the firmware and driver to the latest version. The enclosure is equipped with 2 pass through ethernet IO cards with 1 ports each. I am only connecting 1 of the IO card pass through card to the network. I also moved the blades around in the enclosure. But no success. The 2 x M620 are still not working. Any idea how to solve this issue?  Thanks. 
Networking dell blade M620 for Dell PE M1000e