That means the PC has turned-off somehow, possibly in a hinbernate state. Have a look in the energy-saving features of the Control Panel.
If you plan to not use the PC for several hours, it saves energy to put it in hibernate mode. With my XP that can be reached by pressing shift when shutting down. That changes the stand-by option to hibernate.
Not sure how to word the title.
Using an HP m9340f, 6 Gb RAM, Windows 7 home premium.
Monitor is Viewsonic 2230wm LCD.
The PC is set to turn off the monitor after 20 minutes of non-use, and usually a movement of the mouse will reactivate it within an hour or so.
But, after extended times of non-use, moving the mouse will not activate the monitor. It will display "no signal." Disconnecting the plug from the PC, reconnecting it, will not reactivate the display.
This prompted me to reboot (holding down the PC's power button). This will then reboot the PC normally, and the display is back to looking normally.
I don't see any instability while using the display, and the color/contrast continues to look normal.
Connections to the PC are good and tight.
Suggestions are welcome. Thanks.