Why do i have a grey thick horizontal line on the bottom of my screen imac

hello
I been having a problem with my iMac 21.5 inch mid 2011 since this monday January 7,2014. Theres a grey and some times black thick horizontal line at the bottom of the screen, I cant see my programs at the bottom of the screen. First its black then turns into grey and it starts flickering and then it stops flickering and it wont go unless I turn off my mac or put it to sleep, and then like an hour it comes back again. please could you help me Thank you.

Hello Armando
Check out the article below for troubleshooting your issue with the display. There are a few things that can be done, like changing the resolution of the display and also to reset the NVRAM to see if that resolves that for you.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Regards,
-Norm G.

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Welcome to the HP Forums!
It is a wonderful place to find answers and information!
For you to have the best experience in the HP forum I would like to direct your attention to the HP Forums Guide Learn How to Post and More
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As you stated it goes away when you reposition the display the connection cable may have become loose or damaged from opening and closing the display.
Here is a link to the HP Pavilion 14 Notebook PC, HP Pavilion 14 Touchsmart Notebook PC, HP Pavilion 14 Touchsmart Ultrabo.... Chapter 4 page 36 has removal instructions that may assist you in checking for that problem.
If your notebook is in warranty or you would like help please contact HP support for assistance.
Please call our technical support at 800 474 6836. If you live outside the US/Canada Region, please click the link below to get a support number for your region.
World Wide Phone Support
Best of Luck!
Sparkles1
I work on behalf of HP
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Why do i have a grey thick horizontal line on the bottom of my screen imac

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