I have recently installed a PNY 8400GS into an older HP Workstation. After installing the card and using the drivers that came with the card the computer would not shutdown, only restart. So I went to PNY's website and got the newest drivers which were the same and still got the same issue. Then I went to NVIDIAs site and they had the same drivers there. I am completely puzzled where to look. I turned of the setting for the computer to reboot incase of system failure and it still reboots when you go to shut it down. Even holding the power button in just restarts the computer. I have to physically pull the power cord out for it to shut down. When you plug the cord back in it automatically reboots. Is there a way I can search for this problem?