I have a thin vertical line rising from the bottom about four inches high

How do I get rid of thin line rising from bottom of my 27" imac screen,comes up about 3 inches....

Hey donald167,
I recommend these steps from the following link:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/HT1573
Reset the system
You can reset the Mac's parameter RAM and SMC.
If you tried all of these steps for your display and the video issues persist, contact Apple technical support or take your Apple computer to the nearest Apple Store or Apple Authorized Service Provider (AASP) for diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).
Best,
Delgadoh

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