my monitor keep flickering at 1280x1024 at 75 herts on my new window 7, i7 4770k computer. my GPU is geforce gtx 550ti. i transfer that gpu from my old gigabyte pent 4 comp and it had no problems with the same monitor. On my i7 comp the gpu drivers are all updated. i tried trouble shooting from window 7 but it didnt display any problems. any suggestions?