Pink & White Vertical Lines followed by a blurred screen iMac(A1312).

Hello everyone, I have a iMac(A1312) since over 3 years now and hence not under warranty.
The problem is it displays white and pink lines on the screen with an apple logo:
followed by this screen:
I've gone the forums which state this is common problem for a lot of PC's apple shipped out during the 09-10 period,
however my Mac is not under warranty anymore. So Apple support told me that it's not covered under the replacement program.
I've been fleeced at my local apple store a couple of times for something I later realized was a very small problem, so I would like to replace it myself.
While I'm certain this is a GPU problem and would most likely be fixed if I just swapped it with a new one, I want to make sure if it is exactly that.
I don't want to be in a situation where I pay a bomb for a GPU and still do not end up fixing the problem.
Also, Is it possible to use any nVidia GPU (As is the case with Windows PC's, where just about any GPU works) or do I have to look for a Mac specific/compatible one?
Any help would be hugely appreciated.
Warm Regards,
Rishav S

I have the same issue on my iMac 27" i7 late 2009 with ATI Radeon HD 4850.
Booting in safe mode is the only way to use it but the system can't do much and it's really slow.
From my findings it's for sure a GPU or VRAM issue so I've just bought a spare GPU board to replace the fault one.
Reballing could also solve this issue but usually you need also a new ATI GPU as well.
I'm not sure about nVidia GPU but it seems that you can replace it with a more powerful ATI Radeon HD 6970M card (if you use games to take advantage of it).
Your post is one year old and probably you already solved the issue so would be nice if you could share your solution for it.
best regards,
Franco

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