The reason for getting a new graphics card is because of blotchy pixilation problems. A friend looked at it for me and as this pixilation happens on the booting up of the pc, thinks it's a graphics card problem. I always wondered if the PSU was powerful enough, could it be related?
I wonder have you tried removing and reseating the card in it's slot? Also worth checking if the secondary power lead is properly attached to the card. Is the cooling fan working properly (can you monitor the gpu temp?) and is the monitor lead snugly attached?