I have a 7935 IP conference station that doesn't respond. When powered on it will go through its usual boot sequence, obtaining an IP, and then it will say it cannot contact the TFTP server. Pressing menu has no effect or any other buttons for that matter and it doesn't respond to the reset key sequence of **#**. I've tried connected to a network and not connected, either way I can't get it to respond to anything. Is there anything else that I can try before labeling it a paperweight?
With a 7935, if any of the keys are no longer responding, nothing can be done about it. I've seen multiple issues such cases, where the only option for a 7935, with no keypad response is RMA. So, if the phone is covered under a Contract or Warranty, then nothing can be done.
Hope this helps