Nope you are already on the way to proper troubleshooting. This should have been done before the board was sent in. Try 1 stick on memory at a time in different slots. If none of the memory you have works, borrow someone elses. If it post then your memory is dead.
IF it still will not post with test memory then you may have a cpu related issue. Remove all memory and power up. Do you hear beep codes? Is no the speaker isnt connected or your CPU is the cause. Make sure you have no power extensition cables in between psu and board. make sure 8 pin to board is plugged in. All else fails remove the heatsink. Power unit on while touching the top of the cpu. If it gets warm unplug it quickly. (means it is getting power). It it is cold then it is not getting power. either because of a short elsewhere in system or cpu is DOA.
This is a good starting point. Let us know how this goes.