GA-P55A-UD3 problem

[macboy3000]

A couple days ago, I just bought this motherboard used from ebay. The seller claimed that it was fully working. After the mobo came and I assembled it, I saw something wrong with my ram slots. When ram was plugged into the last 2 slots to the right, nothing would show up, though I could tell that it is on b/c of gpu fan running; however, if ram was plugged into the last 2 slots closest to the cpu, it would boot up. What was also odd was that this morning, when I tried plugging in ram to the last 2 slots, the bios would detect it, but it would show that it's not enabled.

[stasio]

Always place your 2 RAM's in white or blue slots (white is prefered).