I had my computer on standby and when I return about in 2 hours, there was only a black monitor. I turned it off and on and I onlygot the DELL screen. The desktop never came up. The light for the HD is not on. I only have a green light for the system.
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check the Power options in Control Panel by default the
1. Turn off Monitor : After 20Mins.
2. Turn off Hard disks : Never
3. System standby: Never
4. System hibernates : Never
May be your system CPU over hight , it may go standby / restart.
feel free to contact me @ firstname.lastname@example.org
Click on the Windows Start menu and go to Control Panel.
the "Power Options" choice located inside Windows Control Panel. The
choices are listed in alphabetical order. A photo example of this
button is located within this article.
Power Options Properties Dialog Box in Microsoft Windows
on the first drop down box, which displays "portable" or "desktop"
types of power scheme choices. Select the one that best suits your
computer use even if it is not a desktop or laptop. Doing this will not adversely affect your computer.
Turn off monitor time options example menu
on the "Turn Off Monitor" options and select your desired time limit
from the drop down box. You can feel free to select "never" for this
choice and any of the others. One column displays "Running on
Batteries" while the other displays "plugged in options." Your
selections can be different for each. Make your choices according to
your use and preferences of your own computer. A photo example is shown
within this article.
Turn off Hard disks example
Click the "Turn off Hard Disks" choice if you would like to change the timing of that.
System Standby choices
on "System Standby" and make any changes to the time limits as needed.
This is optional. It may be best to select "never" or at least a few
hours for this choice.
"System Hibernates" if you wish to have your computer hibernate (or
"sleep") after a certain length of time. This again is entirely
optional and not required. When you are finished, click "OK" to save
all of your choices. This is very important.
I suspect the power supply for the monitor. Try a power supply from a working monitor. If you have a used computer store nearby, take your power supply to them and try it on another monitor.
There is no need to turn off a monitor using its power switch. Monitors automatically go into standby mode when they are not receiving a signal. In standby mode they use less than one cent of electricity per day. If saving electricity is your goal, raise the temperature in your home by a degree and run the air conditioning less.
Your power supply may not be supplying the required electricity to keep your monitor on. Try plugging your monitor in a different electricity source. Your CPU may be drawing much power from the source and not enough is supplied to the monitor. You may plug the monitor directly to the UPS (uninterrupted power supply) if the cable end allows it.