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

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no video on the screen 3 diagnostic led every on?

hi

i have one imac a 1224 and non video on the screen

The diagnostic led on the logic board are

1on, 2 on 3 on but there isn't install the video card

because the led 3 is every on

my logic board is dead?

please answare me

dear Silvano

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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

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Hook it up to an external monitor with the video card in and see what you get.

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hi

but on my logic board the led 3 is every on when i press the power button

but the video card isn't install?

thanks Silvano

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so, you are saying that you do not have the videocard installed on the logic board and the third LED is coming on. then your logic board is possibly dead. if you install the video card, does LED 3 come on? do you see video?

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hi

if i install the video card on the logic board

the led 3 is on but there isn't the video on the screen.

dear Silvano

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sorry for the delay. i would recommend replacing the logic baord at that point.

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silvano さん、ありがとうございました!
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