This problem may occur due to wrong driver of display card or wrong display settings.
Solution: 1- Start you computer in safe mode. 2- Remove display card driver. 3- Restart you computer. 4- Install display card driver (if it does not pick automatically).
Now it should show default settings. I hope it would solve your problem.
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Try to see if this works on another computer first, if it does, then it assumes the monitor is ok. Then as the computer boots up, boot to safe mode by pressing F8 and once in that state, set the display to a mode that the graphics card will support. If none of the full colour options work, the graphics card may be incompatible, try changing the graphics card.
He may have changed the display settings on the computer. He may have altered the refresh rate higher than the monitor can handle.
You can try start the computer in safe mode (F8 repeatedly on boot up, till the safe mode option comes up)
This will load basic video drivers, you should be able to check your settings now.
Windows xp / right click on desktop and your settings are there
OR control panel / display
Your resolution is set above what the monitor supports.
when computer is first starting up hit f8 to get to boot modes.
choose Enable VGA Mode: This option starts Windows in 640 x 480 mode by using
the current video driver (not Vga.sys). This mode is useful if the
display is configured for a setting that the monitor cannot display.
When you are booted into windows you can then set your resolution to the highest that the monitor supports which is 1440x900
The resolution or refresh rate of the computer is not compatible with the TV. Before the computer starts loading Windows, start tapping F8 and select "Enable VGA Mode" from the menu that appears, this will set your computer to a very low resolution (640x480). I believe the option is actually called "Enable low resolution video" on Vista, it's VGA mode in XP. Now you should get a picture on the TV, work your way up from there.
when starting windows press f8 key before the windows logo shows up > go to safe mode > click start>control panel> display>adapter>list all modes> choose 800x600 x 16 colours > apply > close > reboot to normal xp. OR When f8 key pressed > choose VGA mode. If this does not work then change the VGA Cable (borrow from someone if its TFT to test)
It appears that the display resolution set in your display properties is out of the range that the LCD can display.
Boot to the ENABLE VGA MODE by pressing F8 to get the Windows Boot Menu. If you can get to the desktop, then go to display properties, and see if you can change the resolution to higher settings and maintain video. (If the video blanks out, then it should revert to the previous setting in 15 seconds)