If you experience distorted video or no video issues, contact Apple or take your affected product to an Apple Authorized Service Provider or Apple Retail Store to determine which service and support options are available. If you plan to visit an Apple Retail store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available only in some countries and regions).
Mac Pro (Early 2008): ATI Radeon HD 2600 XT video card with distorted video or no video
The ATI Radeon HD 2600 XT video card repair extension program ended on December 7, 2012.
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