Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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How do you turn on diagnostic?

what is the process to turn on the built in diagnostic for my 2133?

I brought my mac o the store and they turned on a feature that show everything on my unit.

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Boot with the D key down.

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Thanks for the info, however it did not work. The process I used was while it was off I pressed and held the d key for 15 seconds, after about 40 seconds the screen turned on in the usually manner, no dianogstics . What did I do wrong?

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Put the apps disk in...then hold the d key down.

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