System won't boot hangs

I have tipped into a 420r and during the reboot all that I see is the following:

SunOS release 5.6 generic

Copyright (c) 1983-1998, Sun Microsystems, Inc.

Note: This server used to have a graphics card in it but was removed

about 6 months ago but the server has been running fine since then until todays scheduled reboot.

Any ideas would be a great help

Thanks

[412 byte] By [kyleg] at [2007-11-25 22:47:42]