MSI FM2-A75IA-E53 Mobo not posting and I refuse to let it die on my watch

[TooMuchMario]

I recently acquired a used FM2-A75IA-E53 motherboard, supposedly, pulled off a working system. When I tried turning it on for the first time there was no post, not even a display came up, and any usb peripherals I plugged in didn't seem to be getting any power. I plugged in peripherals I was sure worked, as well as monitor and display cables. At first I had installed an A4-7300 cpu, but learned that the motherboard may have needed a bios update to support that cpu. I bought an A4-5300B to update the bios, still no post or power to usb. I do want to mention that the cpu fan turns on, the cpu is heating up, and the psu turns on. I know for a fact the psu, ram, peripherals, monitor, and cables work. There is a slight buzzing I can hear in the cpu socket even without the cpu installed but I'm not sure that is the problem. Apart from all this, the only weird thing is the 24 pin connector is difficult to plug in and unplug, but I don't see anything physically wrong with it. 

Any help would be so greatly appreciated.

[FakeKGB]

Do you have a separate graphics card you can test with?
That's all I can think of so far.

Also, the 24-pin connector is hard to unplug on basically everything.

[TooMuchMario]

I just tried it with a separate graphics card. No dice.