Colored Lines on Cinema Display (30 inch) at start up

Sometimes when I start up my Mac Pro (2012 model) I see colored lines on my Cinema Display (30 inch).
It is gone when I press the start switch again.
What can be the problem?
The Mac Pro has a ATI Radeon HD 5870 1GB Graphics Card.

It is sometimes a sign the inverter cable or board is beginning to go that is used by the LCD.

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