new build boot up no display

Julio Supangan

Honorable
Jan 20, 2014
1
0
10,510
Hey I built a new computer but there's no display when boot up.
All fans working
No beep no display

Asrock extreme 3 970 r.20
Fx 6300 6 core
HD 7870 of by gigabyte
Ocz modular 80+ 500w PSU
Patriot viper 1x8gb 1600mhz
CD drive
1tb Toshiba 7200 64mb HDD

Like I said I check everything and plugged everything correctly
No beeps or display on monitor
Keep in MInd there is no onboard VGA so I'm using the hd 7870 HDMI and or dvi connectors.

Thanks please respond.