Hello, i have a gigabyte GA-M57 SLI S4 M/B and 2 HD 6970 grapchic cards but i carn't get no signal from the motherborad,i have a Brand New 1300w psu. When i plug the geforce graphic card in the PCI-E  m/b its shows up stright away.  Someone told me i need a crossfire M/B is this true?  Would be greatfull if any could help me please,also the Radeon 6970 fans spin and i have tried using PCI-E 1x to 16x Powered 1.0M USB 3.0 Extender Riser adapter   but still no joy and do i need to connect the crossfire cable to both cards ,can someome please help me please its starting to get me down tried everything.
AMD Athlon 64 X2
Spec   x3ghz
Ram   DDR 3 4GHz
1 TB HDD

DO I NEED A NEW MOTHERBOARD?

Thanks for the advice.

I was thinking about mining bitcoin or altcoin,was thinking about buying a asic mhs 200 200 GH/s setup,not really bothered if i take a loss because i would of just wasted the money on something else plus i have a good job,it will be more of a hobby really but would be nice to make a bit of money,also thought about litecoin mining with 3 R9 280X cards as i have built custom computers in the past but its easier to buy a asic setup complete ready just to plugin and start mining,i will probably build a litecoin rig later when i have done more reading.

I can get a ASIC 200 GH/s for £1500 imported.