Video feed choppy & "stretchy" screen

hello, i am having some trouble(s) with my video display; first the top third of the screen is all blurred with horizontal lines, "stretching" the windows and desktop up into the top inch of the moniter. second, video feeds are coming in choppy, only refreshing about every 2 seconds, i thought this was a memory/space issue, but i cleared out the hd to free it up and the problem is still occuring. the audio comes through fine. thank you for any help you may offer.

I had a similar issue once with my eMac. I don't know if it is exactly the same problem but for helps sake I will mention it anyways.
My display started behving similar to the way you described. And at first I suspected interference because there was a refrigerator on the other side of the wall and sometimes the cooling unit in refrigerators can be the culprit.
Anyways I moved the computer hoping that this would solve the problem but unfortunately no luck. I next took it in to an Apple Repair Technician an found out that the problem was an I-VAD cable had gone bad. This most likely is the cause of your display problems. Unfortunately it sounds like your warranty is long expired and the required repair was $900 (I had AppleCare Protection thankfully.) So in your case you might be better off just getting a new Mac since the one you are currently using is quite outdated.
Hope this helps.
-Patrick

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