A checkerboard pattern does sound like a codec/hardware problem as Floh indicated.
Is your slot config per the recommendations in the CPG?
Do you have any other third-party PCI cards in the system? If so, try pulling them.
If you have access to more than one Finish system, try swapping the boards between them and see if the problem follows the board.
You could also try looping the diags to build up stress/heat and see if it might fail then.