Check the hdd, make sure everything is plugged in. See if its powering on, if theres no power or sata connection it would cause windows not to load and maybe sit at the bios. Since u tested ram, and u can still see bios guessing ur gpu works, and only thing i can think other than hdd would possibly be a cpu.
I see ur board has the debug led, what is it displaying when u power on? read ur manual to find what code ur getting. if it stalls on one code thats ur issue.