PSU works on one motherboard but not the other

So I just finished my build. I'm on Windows 10 64 bit. Specs are:

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So I shutdown my pc lastnight then flipped the psu switch off, this morning take a crack at disassembling the riser card from the pcie slot, reassemble the gpu and riser card again, then go to turn the system on and........ nothing. I disconnect the riser and gpu, disconnect the hd, ram, etc, still nothing. Put the PSU in my old case hook it up to the old motherboard, boots up instantly.
I should note that the case was open with the motherboard exposed as well as the psu sitting on my desk until i get an sff corsair 450w. Before this i was having trouble with display drivers not working properly on my gpu on this build. The gpu and hd and psu are from my previous build and they all worked together flawlessly. So I am not sure if this is from the psu or the motherboard. I should also note upon powering off the psu I heard a faint buzzing sound.
 
Solution
Try putting the ram back into the pc with the cpu/heatsink and see if you can get it to post. The motherboard won't post without ram inside, unless you have sound diagnostics and if so, you should of heard the sound of ram missing if the motherboard turned on at all.

PvEdominator

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Try putting the ram back into the pc with the cpu/heatsink and see if you can get it to post. The motherboard won't post without ram inside, unless you have sound diagnostics and if so, you should of heard the sound of ram missing if the motherboard turned on at all.
 
Solution

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