How to fix a screen cable problem on a MAC desktop?

[Daisy]

So I have had my mac desktop since 2007 and can barely afford to fix it or by a new one. I am not sure what model it is, but it looks like this: http://img.tomshardware.com/us/2007/09/0...ops_06.jpg

Not to long ago, it started getting multi-coloured lines vertically down the screen. Then out of no where, a huge black bar came and cut off part of my screen to the right of my computer. Now it repeats the screen before it. So today I went on Safari and the duplicated part on the right of the black bar started flickering. Also some parts of my screen are lighter than others. I have done some research and they say it is my screen cable that has come loose.

Please help!
Can someone please give a step by step?

[Bob]

Here is all the mac and apple help in one place... Hello, Ask Apple here for free 1-800-MY-Apple ,and check out the sites for more informaton http://www.apple.com/support/ and
https://discussions.apple.com/thread/246...0&tstart=0
http://www.facebook.com/pages/TheAppleGossip/...
http://www.apple.com/macosx/recovery/
http://9to5mac.com/
http://appleid.apple.com
http://www.apple.com/support/mac/facetime/
http://www.ifixit.com/iPad-Parts and Mac parts
http://www.apple.com/iphone/built-in-app...phone.html
Hey, I enjoyed your question, I have worked as a technician most of my life, I
hope I have helped you...
Good luck...

CompTIA A+ Certified Computer Professional