I just had a 25 user Netware 6.5 server (with not patches) lock up. it
was implemented about 15 months ago and has run perfect. It just locked
up with a message that the system was halted ad it may have been from a
memory corruption.

All I could do was a cold reboot. The server came up fine and is being
used again. How do I determine what caused the problem or what may not be
working correctly that could cause it to lock up again?