Hi There and Welcome to Fixya,
The first thing you should do is to check if the pins in your VGA cable connector (from the monitor) and make sure if they are "complete and straight" - no bent or missing pins etc. It would be best if you have another PC or Laptop to try your monitor display out so you can determine which is really the problem.
In case you experience the same issue after trying the display out from another PC, then it is evident that there's a need to replace your LCD monitor. Now, if it's the other way around, then it's quite possible that you can resolve this by :
I hope this helps,
Thank you for using Fixya.
Basic LCD monitor and LCD TV troubleshooting guides:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
Failed LCD monitors, LCD TV's pictures: http://s807.photobucket.com/albums/yy352/budm/
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