DL380 G5 just halts without a log entry running VMware 3.5 ESX

[MARC54]

I have 3 DL380 G5s running VMware 3.5 ESX.  They have running fine but one began a new problem.  It just halts and shuts off.  I checked the ILO logs, the VMware logs, etc., and there is no reason shown in any log why.  I ran 25 passes of Diagnostic software with a good outcome.

So I rebooted VMware host and just let it run with no VMs running on it.   After about 8 hours or so, it did the same thing.  When it halts I get the following LEDs:

System Health Blinking Amber and both CPU leds are solid Amber.  I checked all the fans visually and they are all running.  The CPU heat sinks are nice and clean.  

Has anyone any ideas of what needs fixing on this machine?

Marc