My screen on my iMac 2008 goes darker in the top 1/3, readable but why?, My screen on my iMac 2008 goes darker in the top 1/3, readable but why?

The screen on my iMac (2008) goes darker all the time in the top 1/3 of the screen.  It has been doing this for the past year.  It's readable but just.  Is there anything I can do to correct this or is it just the screen is dying?

Either the display or graphics card is in trouble. Run Apple Hardware Test in extended mode three times back to back. If errors appear then a hardware issue is confirmed, the next step would be to take the machine in for repair. Because the machine is 6 years old now you may want to consider looking into a replacement for it. 

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    You are prevented from Airplay mirroring certain things like DVD content as the material is usually protected so you get a checkerboard type display.  I think there is a theoretical risk that the Airplay stream could be intercepted and the protected video copied, albeitin lower quality.
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