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1. Did you try updating video card drivers?
Please go ahead and follow the methods mentioned and later update us on the status of the issue.
Method 1: Try to uninstall and reinstall the video card driver from your computer in Device Manager and also from Programs and Features.
**Step 1:**To uninstall from Device Manager, follow the steps given in the link below:
a. Click Start.
b. Right-Click Computer.
c. Click Properties.
d. Click Device Manager on the left hand side.
e. Right-click on the video card driver.
f. Click Uninstall.
g. Follow the prompts to continue to uninstall the Driver.
**Step 2:**To uninstall from the Programs and Features, follow the steps given in the link below:
****Uninstall or change a program
Once uninstall restart the computer, after restarting by default the driver will install it successfully, if not try to install it from manufacturer’s website.
Additional information: Getting the best display on your monitor
http://windows.microsoft.com/en-us/windows7/Getting-the-best-display-on-your-monitor
If the VGA adapter is broken then I would recommend you to contact with the computer manufacturer.
Please perform these recommended steps and post back if you are still experiencing the issue.