Has graphic card broken?

Hi,
After I have upgrade my iMac (early 2008) to mountain lion, It run slow and few days ago It freeze with some lines cross. I have tried safe boot and it seemfix for a while and it freeze again. I did clear PRAM. It still stucks on gear spining with slow bar move and then shutdown itself. The display shows white with strips with green snowing lines about 1/4" wide, distributed with three lines a set.
https://drive.google.com/?utm_source=en&utm_medium=button&utm_campaign=web&utm_c ontent=gotodrive&utm_term=carousel&usp=ad_search#folders/0B5qR4GFGRbsnOFBsNVNDcn ViVG8

Your link leads to a Google sign in page? Were you trying to post a screenshot/picture of your desktop? If so, plese use the little camera icon in the toolbar of the reply window and navigate to your screenshot to upload it.
And yes, it does sound like a graphics card issue. You might want to take it to the nearest Genius Bar for a free evaluation/diagnosis.

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