PC Troubles

I bought a new MOBO and moved everything from my old computer into this new MOBO, except for a new video card I bought. I connected everything, and the LED light on the MOBO lights up, the hard drive starts up, the CPU starts up, even the video card fan starts up. But I get no picture. I tried a new powersupply, I made sure the video card worked in a different PC but nothing seems to work. Do I just need to return the MOBO? I don't know what else could be wrong. Thanks in advance.