Issue with serial connection - QM9700 InfiniBand Switch

Hello Nvidia experts,

We were unable to establish a serial connection using a console cable to the QM9700 InfiniBand Switch. A reset was performed, it shows boot up process, but the login prompt did not appear, and no amber LEDs were observed. What can be reason for that?

Thank in advance for your reply.

Best regards,

Are you using a cable that came with the switch?
Or a 3rd party?