I have this motherboard and there's something really weird happening with its slots, before only the black (dual channel) slots were working and I could put RAM sticks only into those two slots, so 2 days ago I got a new power supply and after I turned the PC on it only loaded 2 GB of RAM (I have one stick of 2GB in each black slot), so I put both sticks in the yellow dual channel slots and when I turned on the PC it loaded only 2GB RAM again. Then I put one stick in the yellow slot and one stick in the black spot and it loaded 4GB RAM and everything is working fine now. But since I want to upgrade to 8GB RAM so I want to know if the motherboard is broken and I need to get a new one, or there is something I need to do in BIOS.