new networkports - devices not seem to be present

Hello

I have changed the mainboard with networkports onboard on a running HP DL360eGen8 Server with RHEL 6.5
Problem is now that the new networkports are not present in RHEL.
I changed in ifcfg-ethx the new MACs,created new uuid for the devices,deleted the 70-rules* file and run start_udev, rebooted...installed the new driver...but nothing helped.
What else can I do???

Thanks in advance.