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I have no display Gpu starts and stops in a second

I have no display Gpu starts and stops in a second
« on: July 06, 2013, 05:24:30 am »
Hi guys, new build specs:
Amd fx 8350 Black edition
Gigabyte fxa990 ud3 mobo
Gigabyte Hd Radeon 7870 gpu
Antec Kuhler 620 water cooler
Corsair 750 Tx PSU
WD Blue 1 tb hdd
G.Skill 2x 4gb Ddr3 RAM
DeepCool IceBlade x 4 Led fans
1LG Dvd combo drive
As soon as i switch on the power switch, i hear the hdd starting to spin, Fans start, water cooler starts, but gpu shuts off immediately. The fans on the gpu spin and stop instantly.
I have tried changing the monitor from vga to dvi, connectors... Tried all the connections, cables plugged unplugged... Tried to remove lithium battery clear Cmos. Tried with/ wo Ram... The gigabyte web page mentions psu req of 500 W on the gpu. Am i falling short on power or is my card faulty?? Please help as i am running short on time before exchange period expires. This mobo has 0 vga ports. Absolutely no display port on mobo, so without gpu it is useless
I have no display so i cant even update my bios.........