Troubleshooting - NVIDIA Docs

The BF2500 Controller Card no longer works	Reseat the BF2500 Controller Card in its slot or a different slot, if necessary Try using another cable Reboot the system
BF2500 Controller Card stopped working after installing another BF2500 card	Try removing and re-installing all BF2500 Controller Cards Check that cables are connected properly
Link indicator light is off	Try another port on the switch Make sure the cable is securely attached Check you are using the proper cables that do not exceed the recommended lengths Verify that your switch and BF2500 Controller Card port are compatible
Link light is on, but with no communication established	Check that both the BF2500 Controller Card and its link are set to the same speed and duplex settings