One node of a two node cluster node not start VM's

Just got back from vacation and one node of a two machine cluster:
- displays status but no CPU usage, server load, memory usage or network traffic graphs.
-the VM's are all "blacked out", are not running and have no labels.

I have no idea where to look. Ideas please on where to look. I can log in to the machine by ssh just fine.


Thanks for the help!

Stan