Koobenhoff,
If you look under the network connections, do EITHER of them have MAC addresses assigned. I have seen this happen before and normally clearing the NVRam resolves the issue.
To clear the NVRam, power down the server and remove the power plug, depress the power button for 10 seconds to drain flea power. Once that is done then open the blade and then move the jumper over.
Once the jumper is moved then apply power to the server and power on until you see any indication of power (lights). Then power off and restore jumper to original location.
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Let me know how it goes.