Ultra 60 won't boot

When booting this Ultra 60, it gets to the 'Initializing memory' message and it doesn't go any further. I can see the disk when I get to the 'ok' prompt and do a 'probe-scsi-all'. What kind of problem does this point to?
[248 byte] By [atlsysadmin] at [2007-11-25 22:40:46]
# 1
did you just get it? have you had it for a long time? what OS? not enough info... haroldkarl oh and this isn't miscellaneous hardware, this is a workstation...
haroldkarl at 2007-7-5 14:16:05 > top of Java-index,Sun Hardware,Other Sun Hardware...
# 2
This server has been around for several years. It has Solaris 8 installed on it.
atlsysadmin at 2007-7-5 14:16:05 > top of Java-index,Sun Hardware,Other Sun Hardware...