Green/purple lines up and down right side of 27" imac

I bought my 27" iMac about 6 months ago, running Boot Camp (problem is not exclusive to one OS, it happens in both Windows and OSX). It started as just a small, isolated square of purple lines that randomly appeared one day as I turned it on. It went away fairly quickly, so I thought nothing of it. It came back less than a month later, except now it went completely up and down the monitor in a thin stripe. It would flicker between purple and green lines, then go away; it usually happened immediately following starup but would go away pretty soon. It got progressively worse and worse, as now it takes up the entire right quarter of the screen, happens basically every half hour or so, continually going away and coming back. Sometimes it will be a stripe, sometimes it will go to the end of the monitor, it is not possible to predict when it will happen, or how bad it will be. Interestingly, if I bring up a window that is completely white, it will go away. It has to be completely white, not even slightly gray. Incredibly frustrating, considering I spent $2200 on this thing.
I've taken several pictures when it happens, I try and go into the Apple store and see if they have any insight, but they tell me they can't tell me anything unless I schedule a meeting at the Genius Bar and bring my iMac in. Worst policy I've ever heard, I'm supposed to bring my heavy, gigantic computer to a crowded mall because they refuse to offer me any support? Or at least tell me, "Yes, that is a common problem, if you bring it in, we can fix it." I have to bring it there, and then take a chance that it won't get fixed right there. Excellent. Especially considering I use my computer daily for school AND work, I cannot afford to go a single day without this machine. Has anyone else experienced this problem, and if so, were they able to fix it? I've included pictures of both the first time it happened, as well as random times it has happened since then.

apple just released a firmware to fix a graphics issue with some Imacs have you tried upgrading to that? It doesn't say anything about this type of issue, but you might want to start there.
If not I would set and apt. and take it into the store it looks like there is something really wrong with the monitor. I saw a friends monitor do something that and he said it ended being an over heating issue. Ether way you have to take it in so they can replace it or send it to be fixed. Sometimes they are able to fix things in the store, but can't do anything for you with out it there.
It is better then going into a best buy and saying fix my PC.

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