I just asked this on a different thread but I really need answerss! I just got a GTX 750 Ti SC because I was due for an upgrade from my GT 610 OC. I took out the old one, put in the new one. Tried booting up. It got stuck on the BIOS screen for 2 min, then went to a black screen with a blinking underscore. I tried updating my BIOS but the most recent update for windows 7 was from over a year ago (the 700 series came out more recently than that). I figured that the BIOS update wouldnt fix it since its too old but i tried it anyway. The bios updated fine but the 750 still didnt work. I looked at the windows 8.1 bios update and its from 3 weeks ago (much more recent than windows 7). Oh by the way, i have a Gateway DX4870 (im pretty sure thats the right model). I talked on the phone with EVGA and they told me to go into the BIOS and turn off secure boot. There wasnt any option for it in my BIOS. He then told me to look for a UEFI option but mine is EFI (apparently thats the older version). Since there wasnt any of the things that he told me to look for, he suggested that i flash the windows 8 BIOS because that might reveal the secure boot option, then turn off secure boot, and then flash back to windows 7. I didnt want to do that because it can brick your mobo if you flash a BIOS for a different operating system. Please tell me how to fix this!! Should i just update to windows 8?? What if i do but it still doesnt fix it?? HELPPPP