One of your PuTTY windows says it is a Sun Fire 880 with No Keyboard then you set the input-device to keyboard. Make sure you have a USB keyboard plugged in for that to work
Regarding sending output-device to screen.. the V880 may not work displaying its console to video (with your monster card) like regular SUN workstations do. You may need to have it bootup and have X Windows start and then be able to use the video card.
If you set input-device as keyboard and/or output as screen then it could appear like you are stuck, but you can wait a bit to make sure it booted the OS or at least at the OK prompt, then send a Break, and type blindly (on USB keyboard if you last set input-device to keyboard):
setenv output-device=ttya
setenv input-device=ttya
reset-all
It should restore serial port input/output.
Diagnostic mode is supposed to default to ttya as well, unless settings have been modified.
