My Video output is upside down on my Monitor after booting my computer. The login screen is even upside down. I tried another monitor, but the same result. My OS is Win XP. CPU is Dell Optiplex GX260. ThX
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First, it could be out of adjustment--turn the brightness and contrast controls up and down to see if it makes a difference. You could have a bad video card in the computer. Do you have another monitor to try to see if the actual video output is good? This is the easiest way of troubleshooting. When you start the computer, can you see any white printing on the screen indicating it is booting? Does the problem start once Windows starts? If so, try starting in safe mode. If you can do this, then I'd suspect video driver problems.
Attach an external CRT (or LCD) monitor to the VGA-output port,
and reboot the laptop. Does anything show-up on the external screen?
You might have to press "FN + something" to toggle the computer:
* video-output only to internal screen
* video-output only to external screen
* video-output to both screens
to get video-output to the external screen.
Or, take the laptop into a darkened room.
Now, do you see anything at all, even faintly,
i.e., your normal "desktop-icons" and "wallpaper" ?
If so, then the "video-inverter" part of your LCD screen has failed.
It's about a $20 part, but you should add $60, for one hour of labour
by a qualified technician, to disassemble your computer, replace the bad part, reassemble and test.
turn your monitor upside down on your desk and look near the clock at the bottom in the system tray. you may have a shortcut there to that video setting, hover above the icons next to your clock, hopefully one of them is your video settings and study in there to change the setting back to the way it was. if not then right click the destop, go to properties, then go to settings in your display properties, then click advanced, and right in there should be a setting to flip the screen 180 degrees back to the way it was..
There are 4 screws on the back that connect the monitor to the stand. Remove them and turn the monitor right side up and replace the screws tightly. OR you can change your layout in your video card settings.
When your computer first boots is everything up the right way?
If so, errrr you may have to turn your monitor upside down to do this with any ease, but have a look in your video cards control panel. It may have been set to rotate the display by a hotkey accidently.
Look the problem it may not your monitor it's your windows XP.
Let me guess you have a VGA/Svideo card. From prior experience I can tell you that dual output Nvidia cards will default to Svideo first, and then "adjust" your windows settings to do so every time even if a VGA monitor is re-connected (HIGHLY ANNOYING).
So if the last thing you see before nothing is the Windows XP boot screen, here's how to fix it.
Boot to safe mode
uninstall your video driver, reboot then reinstall.
You can substitute a system restore for uninstalling your drivers if you can remember when the monitor was last working.
This really really pissed me off when it happened to me.