It's tricky, there are a few things that could be happening.
First, I believe this is a Hybrid EFI motherboard, not a true UEFI one, and Nvidia's GPUs since the 700 series aren't always cooperative in these cases.
Second, if this is an older Corsair VS 650, with orange or green lettering on the unit, it's a low-quality PSU and you shouldn't be pairing these together, and that could be causing issues.
The final issue isn't really one of compatibility. Unless you're upgrading your CPU/motherboard/RAM in the very near future, this pairing makes little sense and a return might make the most sense. You're talking about a budget CPU from 2011 here and you're literally paying hundreds of dollars for performance you'll never see with this CPU. Much past a 750 Ti will have diminishing games with this platform, maybe a 1050 Ti though I think that would be a stretch.