Welcome to Windows Seven Forums. First a couple of questions.
1. Does your monitor show up in device manager as the Benq, or PNP? If PNP try checking if the manufacturer has a driver for it and install it.
2. Could you please provide the exact model # of your RAM modules?
3. When running both Dimms do you have them in the same colored slots or if not different colors in the slots as showed in the manual Dimm 1 in A1 slot and Dimm 2 in B1?
Chapter 2.4 in manual. ASUSTeK Computer Inc.-Support-
Also have you tried running Memtet86 with one in at a time 5-7 passes? Then removing it and running the second one in the same slot which would be slot A1?
Then if no errors try the same in slot B1 same as above. Memtest86 - Download Page
A couple of things trying to find out
1. if the memory is error free in both slot thus eliminating the slots and the Ram as suspects.
Then try with both in A1 and B1 if you can without getting the black screen.
Also when they test the QVL ram they test them in a kit of 2 modules in order for the Ram to met the qualifications to be on the QVL.
You have done some extensive trouble shooting and I would at this point also consider that it might be the motherboard memory controller.
What happens if you try both dimms in the A2 and B2 slots?
The fact that it will run with both dimms in while in safe mode makes me think it could be a driver conflict though.
The only other thing I can think of would be if possible to borrow 2 sticks of different ram and see if the problem replicates itself.
I wish I had something more to offer to try but this seems to be a rather perplexing issue.And you have done most of What I would have suggested for trouble shooting already
I have updated the BIOS from the Asus website.
He states here he has already updated the bios so....