Quote Originally Posted by gtj View Post
Try your 1 stick in each of the slots just to see if all the slots are OK.

Sounds like it may be a voltage problem. I.E. not enough juice to run more than 1 stick. Do you have a multimeter? You might want to check the Vdimm.
I have tried all slots and they seems fine. Can someone please give me link to how i can check vdimm voltage? thanx.