Horizontal grey thick line - iMac C2Duo 2,4 GHz ATI HD2600 (late 2007)

On my iMac 24" i have an horizontal line grey line, thicker at middle.
Seems to be sometimes more viewable sometimes less.
Also my dock seems to be burned in (or shall i write it "persists").
Some screenshots:
http://lh5.ggpht.com/7n3M2I6_QAg/SrsjE_telzI/AAAAAAAAEgg/-yzM5atrJg/s800/R0010097.JPG
http://lh5.ggpht.com/7n3M2I6QAg/SrsjM8TWu8I/AAAAAAAAEgk/iQHCFOaSXew/s800/R0010096.JPG
Any idea what this is? Apple customer center in Germany was kinda rude over phone ...
Also i am out of guarantee, only the 2 year seller guarantee is 1 month available...
Message was edited by: Benno Bradler
Message was edited by: Benno Bradler

Thanks for reply Carolyn,
done the hardware test, no trouble found.
The grey line persists, i think, from my observations in the last days, it becomes more and more visible (also thicker) while the temperature inside my iMac gets higher.
When starting the iMac next day, the line is barely visible, still there, after some time it will get more and more visible till real annoying.
Now what could this be? And what should/can i do? Ignore it? What if the problem gets bigger with time passing?

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