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

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No video dislay or backlight Diagnostic LEDS 1,2 lit, LED 3 flashes

My Intel Mac has died! No video or back-light. I get the start up chime and the HDD sounds like it is doing something.

Diag LEDS 1 and 2 come on and LED 3 flashes momentarily.

I can load/unload CD's, and the power button seems to put system to sleep and pressing a key seems to wake it up too.

I have checked that the VGA card is not obviously damaged.

tried resetting the SMC and the PRAM to no avail (not surprised really)

Sounds like either the VGA or the Logic boards have died!

Une réponse ! View the answer J'ai le même problème

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Apple iMac "Core 2 Duo" 2.4 20-Inch (Early 2008) Specs

Identifiers: Early 2008 - MB323LL/A - iMac8,1 - A1224 - 2210

or the 2,66 GHz model


2.4GHz - HD2400XT VGA


the VGA is Kaput! Guess this baby is destined for the scrapheap...


richdave, Here is an excellent forum on modding/hacking video chip firmware for the Mac.


Thanks ABC Cellars.. not sure if I will find a solution there but it will be quite a few hours of interesting reading...


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Solution retenue

This is straight out of the book.

If LEDs 1 and 2 are

on and you heard the

startup sound, but

LED 3 is off, video

card may either be

installed incorrectly

or need replacement.

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Score 4


+ but not everybody has the book :-)


I realize that, I just didn't want richdave to think I made it up ;-)


Thanks Mayer. I too have the book! I suspect that the VGA is Kaput! I'm toying with buying a non mac Mobility Radeon HD 2400 and seeing if it will work. Same form factor and I suspect the pin outs are standard. Firmware on the card is my main concern.


Well I tried an ext monitor and it too is blank... not surprised really.


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Richdave sera éternellement reconnaissant.
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