Do you have a system speaker plugged into the motherboard? Try with just the bare bones, i.e. take out the sound card and one of the HDDs. Make sure everything else is seated correctly, take them out and put them back in if need be.
If that doesn't work, step through this guide and let us know how each step goes: http://www.tomshardware.com/forum/261145-31-perform-steps-posting-boot-video-problems