Is your HDD new/fresh? or does it contain the previous OS of your previous system (motherboard and all else). It might be because your HDD contains the previous OS, I tried to use my SSD to boot my Intel Core 2 Quad system and the system didn't boot at all. The SSD was used in my AMD system though..
What's the model and manufacturer of your PSU? How did you test that your PSU was fine and wasn't the one causing the problem?
Also an idea but not really sure though, AsRock website states:
- Dual Channel DDR3 memory technology
- 2 x DDR3 DIMM slots
- Supports DDR3 1333(OC)/1066/800 non-ECC, un-buffered memory
- Max. capacity of system memory: 8GB*
Maybe you need to OC your system, dunno which one though to make a 1333Mhz RAM work.