Hi,
I have a 650Ti Boost, too and when i plug it in my computer won't boot at all. It took yours two minutes to boot? Maybe i should try that.
I am using a 500w corsair bronze psu, are you having more power?
what was the issue with your uefi? I have a gigabyte ga-b75m-d3p with bios/uefi f4. Do...