To determine if you have a graphics card.

run prtdiag

/usr/platform/sun4u/sbin/prtdiag -v | grep xvr
/usr/platform/sun4u/sbin/prtdiag -v | grep pgx (older type of graphics card)


or

as root run eeprom

eeprom | grep output

if output-device = screen high chance there's a craphics card in the box
if outout-device = ttya it's probably connected to a serial device like maybe a wyse or dumb terminal