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Logic board or power supply: how do I determine which is bad?

Push power button, chime sounds, light comes on and that's it until fan starts about a minute later. Screen stays dark. I tried all the resets and they don't do anything. I'm prepared to replace the logic board or the power supply but wanna make sure I'm replacing the bad component. Help!

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What happens when you connect to an external display?

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Here are some links that should help you.

http://support.apple.com/kb/TS2094

LED power supply and logic board tests...

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