Have you checked all molex connectors that the fan can plug into?
Not sure that he read all of #15.
Pull all the components out of the case, and bench test. The only way to be sure. Also clear the CMOS.
What model is your PSU, and how many watts can it output? The 680 is a hefty card, and this is an unlikely scenario given that it worked in your old case, but maybe you could have killed the power supply.what is the cmos? Just the heads up this is the most ive been inside the case than ever before.
The last things I ever changed was the graphics cards twice (Nvidia 550 Ti to nvidia 680) and the psu.
What model is your PSU, and how many watts can it output? The 680 is a hefty card, and this is an unlikely scenario given that it worked in your old case, but maybe you could have killed the power supply.