Strange screen issue on Mac Pro start up

Hi,
Lets say every 1 in 20 times I start up my 2010 Mac Pro I get a stange tartan effect on the screen which flickers.  Sometimes it has even had a screen with
static like a television.  The only way to fix this is to unplug the DVI connector on the back of the computer and reconnnect - after doing this the issue is
resolved until the next time it happens.
Furthermore I don't believe it is a software problem as I have had this issue from day one of owning the computer.  I stupidly assumed that a software fix would
be released and didn't persue Apple for a repair/replacement. 
The problem persisted into OS 10.6 and 10.7 and 10.8.
Graphics card replacement?  Any advice would be helpful.
Thanks

Yes it is the card that came with the computer.  I'm using the 30" Cinema Display (2560 x 1600) though DVI.
Spoke to Apple Care and they haven't got any records of similar issues.

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