I've tried flashing with a single memory stick in the first DIMM slot (following the integration guide instructions for placement of a single stick) and the results are similar except the system seems to no longer power itself down.
Can any USB port be used? I have an 8GB USB drive and I've been using the yellow high current USB 2.0 ports.
Some additional info.:
the board is compatible with the 3770S processor using BIOS 69.
And according to:
KINGSTON KHX1600C9D3 2 GB 1600
the RAM is compatible.. so I'm stumped. Both the 12-pin and 4-pin power supply cables are connected, BIOS jumper is correct, I've double checked that the CPU is installed correctly with pin 1 oriented as it should be, etc.. not sure what else I can try. No video, no beeps from the board. Guess I'll give Intel support a call tomorrow..
As a follow up, I ended up RMA'ing the board. The new board worked the first try.