An acquantance has a problem. He has a 4 core Intel machine with lots of RAM. He was running Win 7 and driving 4 monitors using an Nvidia Quadro NVS 450 with no problem. He allowed his machine to update to Win 7 SP1. Now no matter what he does he can only get his system to recognize 3 monitors. He has downloaded the latest driver from Nvidia. Installed\Reinstalled etc. He can connect any combination of monitors to any combination of the 450 ports. But only three monitors show up in the Nvidia Control Panel or the Windows Control Panel no matter what. Anyone have Win SP1 and a NVS 450 with four monitors running? Did you do anything special?