Hello.     LED indicators 1,3,4 indicate some hardware component failure on the system board whereas 3, 4 confirms that you are having memory failure. Did you recently replace your memory? Power down the server and test each memory module one at a time on slot 1 and look out for the diagnostic indicators. Identify the failed memory and replace. 
My PowerEdge T100 II stopped running. I've got the following behavior when power button is pressed: Monitor and keyboard don't even try to do anything. Is it memory failure? The thing is that I have 4 memory modules (used to work perfectly well), I tried removing all modules and reinstall just one, tried different slots and different modules - nothing helps. Same 1,3,4 error, and then 3,4 + blinking amber. Is there any way to figure out what causes the issue? Is it a memory failure, or may be mother board issue, or something else? Thanks.
PowerEdge T110 II - faced memory failure?