My Mac pro tower has an "ATI Radion hd 2600 XT" video card, and it stopped getting signal to my tv, are there common problems known? How can I troubleshoot this problem when the signal isn't reaching the screen?

My Mac pro tower has an "ATI Radion hd 2600 XT" video card, and it stopped getting signal to my tv, are there common problems known? How can I troubleshoot this problem when the signal isn't reaching the screen?

http://discussions.info.apple.com/thread.jspa?messageID=12248238&#12248238
http://discussions.apple.com/thread.jspa?threadID=2649035&tstart=0

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