Has this always happened,
if not it could be a windows file that is not correctly installed (re-install of windows for that one.
I had a similar experience with a ECS K7S5A m/b, first boot of the day, it would not even goto post, cdrom lights flashed, fans spun up but nothing else.
in my case i got round it by trying to start up, then pressing the start button for five seconds to force a power off, then power on again and everything worked ok till the next morning.
I got a Trojan/Virus which corrupted my bios, so i flashed the bios and it also solved the startup problem.
so, my advice if nothing else works Flash your Bios, but only as a last resort, wait and see what others suggest.
good luck with whatever you decide