I'm still thinking it's your psu.
What about you fill your spec so we can work on your case ?
Go somewhere else ?when I'm trying to help you out, you don't help us saying HEY GUYZ IVE GOTZ SOME FLICKERZ DEAD 580 AND NOW MY CF DOESNT WORK.
THIS IS 90% SURE IT'S POWER SUPPLY RELATED SINCE THOSE CARDS ARE ENERGY HUNGRY.
No specs we can't search for the right thing.
Once you'll have filled them we will gently help you out.
(I had to same problem trying to crossfire 2 4870X2's a year ago)
WHAT IS YOUR PSU I'M THRILLED NOW,
So let me resentence all your problem.
You killed a 580, you try a 6970 crossfire it does some weird stuff and you did try to quadfire 4870 and it didn't work.
I wonder what the problem is.
It's may be your PWER SUPPLY ???!??!!?!?!?!?!?!?!?!?!?
wanna get on my band wagon now ?
I got to agree with others, I heard there was glitch with AMD Radeon's and crysis.
I'm still interested into knowing your pc specs though
Maybe if you read up ull find them out, but as your still on the Corsair wagon i spose you havnt taken the time to look up and read..
Anyway the others have helped me without talking about PSU's and the like