I don't see the power for the vid card plugged in. It could just be the picture.
Do you get any beeps during POST? Anything on the screen?
In the pic you posted, it looks like there are diagnostic lights in the lower left corner of the mobo. The manual should have explanations as to how to read the lights. They all appear red in the pic. I assume they should be green. There also seems to be another LED up by the RAM, which also is red (yellow?)
Also check the front panel connections. On my old case if I tried to use the firewire connections, it would lock the comp up.