Please check the AA number labeled on the board itself (near serial number). It should be E98681-352 or higher. (See here how to find AA number Desktop Boards — Find support by board AA number)
(BTW - which memory do you use exactly?)
Hmm maybe I'm blind but I can't see the AA number on the board. From the box is a version number G71018-102 if that is of any help. Maybe I should mention that it is a server board?!
About the memory I got the wrong block. I've ordered a new one that should fit accordingly to Intels compatibility site. The first block I've got made the board beep 3 times which indicated that the memory was wrong. meanwhile I had a 2 GB block which did fit without beeping. But maybe the memory causing the problem.
The label is between rightmost slot (x16 PCIE) to the left. While label.
See picture of a board with this label:
The number on the box is the TA (Top Assembly) number and represents everything that goes into the box. The AA, or actually the case for the S1200BTL the PBA number, is the part number for just the motherboard. Fortunately we have a tool that we can get one for the other. Your G71018-102 TA number corresponds to a G68718-102 PBA number.
acording to this page the S1200BTLRM does support the Xeon E3 1220v2
and the page you refer to say that it is E98683-352 or later. G68xxx isn't it later?
The CPU is from Q2 2012 and the board is from Q3 2012. Not that it is a sure indicator that it should work.