I went into the BIOS and loaded optimized defaults and then saved and reboot. Then I powered the computer down and re-installed the graphics card, when I powered the PC up again there was still a blank display. Doesn't seem to have worked? Surely it can't be to do with the display seeing as it works fine when the graphics card is removed, although I'm still not sure if the graphics card is faulty because the LEDs on it turn on and the middle fan (there's 3) spins up.
I have tried re-seating the graphics card into the same slot and also into other slots, it makes no change. I have connected two PCI-Express connectors (8 pin each) into the corresponding two slots in the graphics card. These are connected into my PSU, the connection into the PSU looks flush and firm. And anyway, if my card wasn't getting power, how would the LEDs and fans turn on? EDIT: Looking inside the BIOS, it seems all my other connections, RAM, storage devices and other components are working properly as the motherboard detects them and shows them in the BIOS.