Thank you Kevin. I will see if a VGA cable stops this from occurring. In addition to this issue showing up when the computer comes back from a timeout, other symptoms are that it might have choosen 59 Hz refresh rate (for no reason that I can think of), and I also have the over-scan problem that others have mentioned. I have to scale vertical and horizontal manuallyto about 60% to fit the desktop on the screen. I don't know if these symptoms point away from the HDMI cable (I think they do!), but I will buy some new cables to see what happens.
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