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Re: The screen in blacked out but computer is on and...
Shut down the PC, unplug the power cord and press the power button to discharge the mainboard, wait several minutes and reconnect the power cord and power system up. Even if this works there still may be a video card and/or other hardware problem.
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not really.. theres a possibility that the monitor is just on standby mode. try to disconnect the power cable of the monitor, then hold the power button of the monitor to drain its flea power. put the power cable back then try it again.
if its going to do the same thing, check the connection of the monitor at the back of the computer. see if its seated properly.
try restarting the computer..
try draining the flea power on the computer as well, possible that the computer is in standby or hibernate mode..
Perhaps your computer is hibernating instead of going into standby which takes a little longer to wake up from. While you are playing plugs and cables it give it enough time to come out of hibernation.
When the computer is in this mode the USB ports turn off which disables keyboard and mouse so the only way to wake up the computer is to press the power button on the computer itself.
One tell tale sign a computer is in hibernation is that the power light on the computer will slowly blink.
Don't let the computer turn the monitor off. Go into control panel and click on power option. don't let the computer turn anything off and disable hibernation if on. go to screen saver and have it come on in about 30 mins.
right click on your desk top then left click on 'properties' in the white box that appears.
this will bring up a 'display properties' box which should have a tab headed 'screen saver' amongst others.
select the screen saver tab.
in this tab there are 2 sections. one to select which screen saver you want to use (and what settings are applied to it), and another section which should be called 'monitor power'.
click the button here which says 'power...' to adjust your power settings.
in the next window there are 4 tabs. select the first tab (power schemes - which should be already selected by default) and you now have 4 options. leave the selected 'power scheme' in the top of the window as it is and just alter the settings for the selected power scheme.
your 4 options are: 'turn off monitor', 'turn off hard disks', 'system standby' and 'system hibernates' i would recommend setting all of these to 'never', and don't forget to click the 'apply' button after you've done this.
i would also recommend disableing hibernation in the 'hibernate' tab (this is in the same window as the power schemes tab).
once you've adjusted your power settings, don't forget to activate one of your screen savers. this is only important if you leave the monitor on for a long time with no changes taking place in terms of what is being displayed. if you leave a static image on for hours you will end up with permanent screen burn. (a ghost image that is always there - even when the monitor isn't switched on!).
i don't bother with screen savers personally as i find them annoying, and find it much easier to simply turn the monitor off whenever i'm not going to be using it for the next hour or more.
hope that solved your problem. apologies if it doesn't.
by the way, the tabs etc i described are what i have on my OS (windows XP pro) and may be named differently if you're using a different version of windows. the 'power options' settings will still be accessible via 'screen saver' tab in desktop properties though.