2012 iMac Vertical Lines & Flickering (Nvidia GTX 680MX 2GB). Anybody else?

My Display is still flickering. I bought it refurbished, so I'm wondering If I bought an IMac which had this problem fixed after the AMD 6970M video card recall. Even if it wasn't, I'm having the same problem with the Nvidia Graphics Card. I would love Apple to take care of this; as far as I'm concerned the problem isn't fixed. Unfortunately, my warranty is 2 months expired.

Anybody else have this problem, with the Nvidia Geforce GTX 680MX? My Serial #: DC*****FMM

I was just about to buy an IPad Air 2. I'm buying a Nexus if they don't do anything about it.

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