Asus GTX 760 OC installed not loading windows

AuroraHD

Honorable
Feb 18, 2014
262
0
10,790
So I recently changed my PSU and got a gpu. My computer was prebuilt with AMD A8 3850 processor. My motherboard currently is a A75M G55. PSU is cooler master i700. I installed the card, plugged in the power cords and a green light appeared on the card. I turned on the computer, it started with a beep, and the display was on, but black with a flashing under square at the top. It beeped a total of 3 times. Now, I don't know what the reason is, but I can guess it's either the motherboard or the bios. Do I have to uninstall old drivers first? I still have AMD drivers on my computer. And if I were to uninstall old drivers and the card still won't run, will I be able to log back in windows? Also, do I maybe have to set the bios to detect the pcie or something? Or is it my motherboard?