|First of all, if the link you provided for your power supply is the one you have then you DO have the correct connectors. They may be separated. Look at the square 4 pin connectors. One has an angled pin on the corner which mates up with the motherboard. The other 4 pin will slide together with the one I just described.|
You need to bench test the board BEFORE installing into the case.
All that you need to bench test is the motherboard with the CPU/heat sink properly installed with thermal pad or paste properly installed, 1 stick of compatible RAM, graphics, monitor, keyboard. The 24 pin, the 8 pin auxiliary power and whatever graphics connector/s your graphics card requires.
NO drives, cards, mouse, etc. No case to motherboard wiring.
Set the motherboard on the outside of the case on the antistatic foam. Momentarily short out the 2 power pins on the motherboard to start up. Disconnect power to shut off.
If the board POSTS then you can install into case and try again. If it POSTS again then you can start adding things. First the remainder of the RAM. After each item is added POST again.