HI, I've connected my SyncMaster 955DF to my PC Dell Latitude D620 laptop, and even though the power comes on, the screen remains blank. The on/off button comes on orange, turns green for half a second, then reverts back to an orange light that now flashes. I've pushed Fn F5 & Fn F8 on my laptop, but it doesn't do anything. You can hear the monitor power up when you turn it on, but there is no hum or any other electronic noise from it after that. Can you please help? Thanks, Nicole