Built new pc. Wont display on tv

Hey guys I built my new gaming rig finally. Everything is plugged up and it turns on fine. All fans working including the 2 on my gpu. However when I turn it on, my tv wont detect a signal through my hdmi wire. Its driving me nuts. I havent been able to install my os yet. What do I do?!

try hooking it up to an old monitor if you have one

Did u plug the wire to the gpu? 

Hook the hdmi up to your mobo first and download the lastest drivers.

My mobo doesnt have hdmi or any display ports. Its a gigabyte 970a ud3. My gpu is the only component with any display ports.

Did you connect the 8 pin connector at the top of the motherboard. Don't be offended i did that with my first rig.

No. Is that whats wrong?

Yeh you must have the 8 pin connected to the top of the motherboard. 

Ok im gonna try it. Fingers crossed.

Its always the little things that you miss.

You are amazing!!!! Thank you so much!!!!!

No problem mate have fun with your new build.

Just wanna say thanks again! Means a lot! Im having a blast. I had to pull myself away from Bioshock Infinite long enough to come here again. I was seriously freaking out beyond belief! You saved the day!

If you have steam add me mcwopppersnaggy.