My server recently just froze. I was unable to ping it, It did not respond to any keystrokes at all and the caps lock and scroll lock was flashing in unison with a steady off-on-off-on rate approx. once a second or so. Edit: My monitor was blank as well (that may be the monitor itself just for the record).
I am running Debian Squeeze with kernel 2.6.32-5-amd64 and the only software that I immediately suspect to be the cause of the panic could be VirtualBox 3.2.10 who I am using that runs a few VM's.
Anyway, I have been trying to find some information on the flashing keyboard led's to figure out if they can tell me anything about the reason for the panic but there is a lot of information from the kernel sending morse code to the kernel just indicating a crash.
What does the flashing leds mean (if anything) and how can I get more information about what caused the crash (if anything had time to end up on a physical disk that is).