7970s not letting me boot when powered

jackirv

New member
Hey guys,

So i purchased my pc last july and had it running perfectly with a simple watercooling loop and a single GPU. I had it running for 5 months give or take and i just finally got around to finishing it today. I had each part working previously, but after countless hours of modding and watercooling i went to turn on my computer to conveniently find out that it doesn't work. Nothing seems to happen when I push the power button, the fans DONT even turn on for a split second. Everything is connected correctly, i have cleared CMOS, tried booting with a single GPU and single RAM module, i have swapped the PSU's around and i am still unsuccessful! The only thing that seems to be working is the green LED on the motherboard. I am starting to think that the motherboard is dead, any thoughts?

RIG

3930K
Asus X79 sabertooth
2x Sapphire 7970 OC edition (both watercooled)
Corsair AX850
Shitty 8gig corsair ram 2x4 @ 1333
bitfenix shinobi
Intel 330 120GB ssd
Seagate barracuda 1TB

Any suggestions are much appreciated!

*UPDATE*

So i unplugged both of the graphics cards from the PSU to find out that my computer will boot up (have no graphic output because graphics cards aren't powered). My AX850 use to be able to power these cards so voltage shouldnt be a problem. I put a 7770 into a pci slot to see whether it would work and funnily enough i did, but when ever i power one of my 7970's the system will automatically turn off and not boot up. Ideas?
 
Seems like a graphics card issue from the sound of it. Do you happen to have another PSU you can use or maybe borrow one from a friend?
 
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