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

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iMac wont start computer dead?

iMac Intel 20" Model A1224

I have a I mac A1224 and wile i was using it, it suddenly turn off. Since then I haven't been able to start it. I opened my mac and turned on the power button but nothing. Led #1 is on but led 2,3,4 are off and are not showing any signs of life also my fans are not running at all, its like the computer was dead. Is it possible that my logic board is bad?? or maybe the power supply??

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You'll need to open it up and check the diagnostic LEDs on the logic board. You'll probably find the power supply is the culprit. Here's how to test it: iMac Intel 20" EMC 2210 Power Supply Output Voltage Test

The diagnostic LED's on the logic board

LED Startup Sequence

LED #1 = Power available.

If no LED is visible:

• Verify AC source

• Verify known-good AC cable is connected

• Verify cable connection between AC inlet and power supply

• Verify cable connection between power supply and logic board

• Verify power supply

LED #1 + LED #2 = Power available, and system is powered on.

If second LED is not visible when power button is pressed:

• Verify power button connection to logic board

• Verify power button functionality

• Verify cable connection between power supply and logic board

• Verify power supply

• Verify logic board

LED #1 + LED #2 + LED #3 = Power available, system is powered on, and video card found.

If third LED is not visible after power on:

• Verify that MXM video card is seated properly

• Verify logic board

LED #1 + LED #2 + LED #3 + LED #4 = Power available, system is powered on, video card found, and internal LCD found.

If fourth LED is not visible after power on:

• Verify cable connections between LCD panel and logic board

• Inspect LCD display cables for cable damage

• Verify external video functionality, and according to result check the following items:

-If external display works then verify/replace LED backlight board

-If external display works then verify/replace LCD panel

-If external display does not work verify/replace logic board

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