Why doesn't my pc recognise my gpu?

Joelan

Honorable
Nov 9, 2013
26
0
10,530
Build a pc today and it doesn't seem to know that the gpu is installed, I connect the gpu to my monitor and my bios and windows experience index dont seem to know its connected, when I turn it on the fans spin up and I get a picture but it's set to 640x 480 and I can't change it, what's wrong?
I don't have internet untill Sunday so I can't try installing drivers