Gtx 780 can't be located

This is my first ever PC build and up until about 4 hours ago i was feeling pretty chuffed with how far i've come.

Board: MSI Z77A-G45 Gsming
Bios: ?
VGA:   MSI GTX 780 Twin Frozor OC
PSU:   CorsairTX750
Intel Core i7 3770k (3.5 GHz)
MEM: Corsair veng ...