Hello, I have just purchased an Apple Cinema Display 20 Model A1038 ADC (Acrylic). It works fine but the POWER LIGHT on the bottom right of the display doesnt shine very much, it looks yellowed. On the contrary the light on the bottom left is fine. May anybody explain why the light appears yellow instead to be normal? Is there any thing I can do to fix it? Is the problem related to the logic board or it is the bulb defective? Thank you.