Bob's computer won't wake up from sleep mode. Leo suggests checking the cable, and the video card. Since he used different monitors, and put in a new video card, it has to be a problem with Windows. He says he just installed Windows 7, and that's when it started. When installing Windows, the Microsoft Installer looks at the hardware and decides what power saving features to put in. In particular, the APCI power saving mode may not have been enabled when he upgraded. Leo suggests doing a clean install of Windows. He should back up his data, format the drive, and install Windows again.