Last night one of our 6509s mysteriously stopped working. When I came in at 3:30 in the morning, the power was on, fans running, but the blades/modules were all dark except for the supervisor. When I plugged in a laptop with a console cable, it came up with a:" rommon 1 >" prompt. I powered it off and on and things seem to be working now, but the log is full only of the powering up messages. Our syslog also shows nothing. That 6509 has been up and running without problems for half a year.
Any ideas what could have caused this or what I can look for?