PC Wont Start Up

[eturkyolu]

First of All this is my rig:

MOBO : GIGABYTE G1.ASSASSIN2
CPU : Intel Core i7-3930K
RAM : CORSAIR Vengeance 32GB (4 x 8GB) DDR3 2133
HDD : SAMSUNG 840 Series 250 GB SSD and Seagate Barracuda 7200 RPM 3TB
PSU : CORSAIR HX Series HX1050 1050W
COOLING: CORSAIR Hydro Series H100i Water Cooler with Corsair Air Series AF120 FOR PUSH/PULL Configuration
CASE : NZXT SWITCH 810

I built this PC for editing.

For some reason my GTX 680 will not work with my motherboard. I've been using my PC worth the GTX 580 from my old computer but school is about to start and I need my computer for editing.

When I first connected my 680 to my Assassin 2 I couldn't get it to work for a couple of days. The card would work, but the computer would get stuck at the POST screen. It wouldn't allow me to choose any of the post screen menus. I tried every method, Even taking apart the entire rig and putting it back together, but no hope. So as a last hope before going to a PC technician I tried my old GTX 560 card and It worked. So I exchanged my GTX 680 with a new one just recently thinking that a broken video card was the problem. I put everything in, start up up my PC and unfortunately I get stuck on the POST screen, AGAIN!

I don't know what to do, IM STUCK! Gigabyte doesn't have customer service over the phone so I have to post my questions on forum sites.

What do you think the problem is? Does it have something to do with the BIOS? Should I try with something newer/older? Do you think I should go to a computer technician? PLEASE HELP!

[NEOCHRONO]

You are must run PSU 1200W Digital n battery 44 Volt for Gigabyte G1. Assassin2.

MY RIG: GIGABYTE G1. ASSASSIN2 n Intel Core i7 3970X+ Corsair H110.

[eturkyolu]

Im sorry, I dont get what you mean by the Digitall battery 44V, could you provide me with an example from an online store such as amazon or ebay.

Thanks!

[oilman]

This may or may not work for you. I updated from a GTX 560ti to a GTX 770 in my x79-UP4 board and it wouldn't pass the bios splash screen, and none of the keys would get me in to bios. I fixed by booting into bios with the old card, finding the PCIe ROM setting and changing from EFI ROM to Legacy ROM. Try this, install your new card and see if it works.