of your mobo at page 2-10 tells that when you place the RAM, the slot 2 and 4 (if you start counting from the closest to the CPU) that they call A1 and B1 should be the ones that allow the mobo to run on even a single RAM, while slots 1 and 3 accept RAM only if the 2 and 4 are already filled AND you have 4 RAM banks, possibly all the same. The page after that talks about some other requirements and BIOS settings you may want to look at.
At page 2-24 there is some weird thing that allows you to ask the mobo if it likes the RAM by pressing a button on the mobo and looking at a led. Have a look and try it. Maybe the mobo hates that ram.
At page 2-26 they talk about a jumper that regulates RAM voltage (this exists for overclockers mainly), make sure it is set to normal (and that it still exists, plenty of guys sell jumperless used stuff, tons of fun when trying to operate them and it goes bonkers).
Fill the slots and tweak settings if needed as the manual says and report back.
That mobo has two PCIe 16x slots, try the card in both, usually the mobo expects the second to be used ONLY if the primary (usually the closest to the CPU but may vary) is already occupied by another graphic card.
Page 2-22 and 2-23 of the manual tells that the blue slot is an actual 16x, while the black one is a 4x disguised as a 16x, so it sucks for primary graphics card.
Read the rest of the manual and check you did connect everything else correctly.
It has a pretty extensive explanation of things you can do with BIOS settings.
I'd recommend to reset BIOS to factory settings by choosing "load setup defaults" in the Exit tab of the BIOS screen. If the previous owner was an overclocker or did tweak things anyway, some leftover settings may conflict with the current hardware.
Atm, it's really too early to decide what and if there are faulty components.