Are you talking about the POST screen or the BIOS itself?
Try reseating your graphics card.Try another Port.
I learnt recently that which connection on the GPU (GTX670)governed whether I say the Post screen or not. As I have two monitors my main monitor is connected to the display port and my secondary monitor is connected to the DVI if the second monitor is not on I do not see the POST screen. At least I did not as all of a sudden it now shows and I have know idea why.