If everything is gone, ie SSH, WebUI and SmartConsole, then is the Smart Server still actually up and running.
If you ping the Server IP from a local device in the same subnet
A) do you get a ping response
B) If no ping do you see an ARP entry for the Server IP.
Is the LOM Card working ( you haven't said the model so not sure if you have one or if you have is it configured )
Don't know if you are local to the device so can you plug a Console Cable in and get anything, presuming of course that is actually powered up, and hasn't simply had the Appliance Hardware Fail.
As a Smart Device presuming you meant a Check Point Smart-1 Appliance then there would be no Firewall on there to block connectivity.