Weird Problem - not sure if GPU related

I recently acquired to Geforce GTX 670 GPUs to run in SLI. I was running one with no problems for a while. I got a new one today and tried to install it. I may have made some error because when I turned on the computer, the fans on both cards went up to 100% for some reason. My monitor would not work either. I took out the second card and my computer worked fine. I tried putting it back in and I realized that I had not plugged in the power connectors completely (I think). When I pushed the 6/8 pin connectors in entirely, the fan thing stopped, but my monitor still did not work and my mouse and keyboard did light up, they had previously. I took out the new card again and found that did not fix the problem this time. The fans (case/CPU) are still spinning and my USB network adapter lights up. I tried taking out both cards and using my intel graphics, but nothing changed.

Specs
Corsair TX750 PSU
AsRock extreme3 motherboard
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More about weird problem gpu related
  1. did you try the new card by itself? if so did that card work on its own? Also did you use the sli bridge?
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