Simple things to check if the mobo is not beeping, make sure that you checked the connections from the PSU to the Mobo, Also check the compasators to check to see if they are "domed" google this to get a better view of what im talking about, 9\\10 times when i have this problem i find that some of the power connections to the mobo arent fully connected. Also check ( im not sure if you posted it ) but if your graphics card requires a connection to the power supply then check to see if they are in as well. Regardless check your monitor or what ever you have it connected to...
Also for giggles, what i do is unplug the power cord, press power button, and pull the mobo battery out. Then put it all back in and power it up, sadly its fixed one of my problems. Try everything. you never know what works.
Yes, check it all out and see.