Thanks for the help.   I tired swapping all the ram about to different configs in the DIMM slots and eventually it booted.  Not sure what was going on as all sticks are the same brand/type ect    and they are all seen by the server now. 
Hello,  For my home lab I have a T310 that has been working fine up until i tried to power it up this week.  The server won't post, the fan tests run but then it just sits (i let it sit for up to an hour hoping it would start up).  the diagnostic lights show  1,2,3 lit up and the HDD indicator flickers blue.  I checked all components (which there has been no change in since the last time it booted) and they are all properly connected/seated. I also tried the minimum boot configuration of only having the following attached to the system:  and the system still won't boot.  The owners manual just list these lights as OTHER ERROR so I am hoping someone here will have an idea of how to get my ESXi server going again.  Thanks! Eric
PowerEdge T310 won't post