Make sure all of your components are seated correctly, and all the power cables are plugged in. Beeps like that are sometimes an indicator that no ram is plugged in, so i would start there. Your motherboard manual should say something about beeping, maybe it even has a beep code to tell you what the problem is.
I ahve also never heard of that PSU brand, so that could very well be a problem as well. With Off brands like that 650w doesnt always mean 650 watts.