To those who own or have built in an s340 case: I'm still rather confused as to whether or not I installed the motherboard incorrectly with respect to the standoffs. As as I can tell, they are pre installed so by simply screwing the mobo into the raised holes, I'm covered. However, the case came with one standoff in a separate baggie that I did not use and am unsure where it goes. Also, my mobo has six holes and I've only used 5 as one of the screw holes doesn't have anything to screw into on the case. Pic of unscrewed open holr you can see because of the light:
http://i.imgur.com/rpS99N5.jpg
Edit: judging from size of the included standoff, I bet if I were to take the whole thing off I could put it in the case then screw the unscrewed in hole linked above on the mobo... thinking about just leaving it becuase i have 5 of 6 holes screwed in, so I imagine it isnt the hugest deal.