Horizontal lines and more

I have a Mac OS X 10.7.5 who suddenly developed a problem with horizontal lines covering the screen and a strong vertical line on the right side (see pix). Sound will always continue if a video is playing, mouse and Tracker will answer but not affect anything (not open, close or move anything). The only thing that solves the problem is to power down. When I turn on the rear, there is a party in question. This has, however, happened twice in the last week... a little concerning that I use my computer in my lectures. I looked at different positions, but none seem to match up with this type of horizontal issue. All the ideas that do not involve me go to the Apple Store? (pathetic bank account)

If someone answers, please use simple as much as possible terms, as I am just an archaeologist. I enter data, download and upload pix and videos, get the computer skills needed... not one of extremely competent computer people.

Yes, you will need it dumb down for me.

Thank you.

What year/model of Macbook. This happens no matter if you are using an external monitor when there lines? If so, it could be your graphics card.

Tags: Notebooks

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