I recently purchased an Nvidia gtx 460 graphics card. Works great but when the monitor "wakes up" after a long period of time (typically when the computer has been sitting overnight), but the monitor image strobes repeatedly and will do so until I have opened at least one new program (which visually can be hard to do with the screen strobing). At that point the strobing rate slows down and stops within about 10 seconds. I haven't actually waited to see if it would continue to strobe indefinitely if I didn't try to open new programs. I'm guessing this has something do to with Windows power savings settings.