Hi,
SC on one of my T5220 is not responding .. it does not show not let me type anything .. what could be the reason for it ? though when i powercycle the box from sc it shows me the system coming up but after that does not let me login thru sc
sc> console -f
Enter #. to return to ALOM.
Most likely cause is a service not haning on startup and console/login is never getting started. Try a verbose boot, or boot to milestone none and see if that gives the failsafe login you can then try to bring the system up the rest of the way manually to see what is causing your problem.
t5220- pls upgrade the firmware first. It has alot of known bugs on system hang issues