My graphics card (Gigabyte R9 270x) is not functioning properly. When I turn my pc on, the fans do not spin and my monitor says no signal. When I first built this pc (3 days ago) it was working fine until I updated Windows 7 with Windows Update. If I switch to the integrated gpu, it doesnt show my R9 in device manager. I also updated all the drivers for it and it didn't work. I have a Thermaltake 550w psu, so I do not think it is the psu's fault. I also noticed that the fans stutter only when I shut down the pc. Any way to fix this?