Model A1174 with 2 GHz Core Duo or Model A1207 with 2.16 or 2.33 GHz Core 2 Duo

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Will not boot/Black screen

I have a late 2006 white 20" Intel 2.16 iMac that will not boot. LCD stays black and there is no chime during the boot process. The first 2 diagnostic LED's both come on but the 3rd never lights up. I have attempted to hook an external monitor up and still no video is displayed. At this point I have replaced the logic board, the inverter, and the power supply. Any thoughts on where to go from here? Is it the LCD display itself of a possible dead CPU?

Answered! View the answer I have this problem too

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I replaced the RAM with known working and had the same result. I also went ahead and replaced the processor and still no luck. Would a failed hard drive show this same symptom? I would think I would at least get some sort of video output. Would a dead LCD screen cause this to fail to boot?


Can you explain what you did in more detail.All things you have changed.


You suggest that 1174 iMac's still exist. I will believe it when I see one. Are there fuses in the logic (mother) board in this model. Can you bake it in the oven to fix it?

== Update ==

Memtest is nice. When I used seatools it seemed they verify that a hard drive is working if you can create a folder on it or read the contents of a folder. They go way into details if you have a microsoft based PC. Oh yea update-there is a guy who has two working 1174's at teckwaste recycles in santa ana CA. Am I surprised


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Ever test the hard drive or memory? These should have been tested before replacing anything else. I would suggest removing the hard drive and memory then testing both with a different machine using Seatools for testing the hard drive and Memtest for the memory.

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I have the same issue with my iMac 20" 2.0GHZ(Early 2006). The front light turns on and I can hear the HD noise and that's as far as it goes (black screen with the front indicator light on). I took out both RAM modules from the slots and power it up, to see what it does. The front light just blinks because it doesn't see the RAM, and that is the only difference.

My iMac 20" 2.0GHZ did not have an internal HD, so I got it from eBay, but did not tested it before I installed it.

I put the my Leopard 10.5.8 Install disk in the DVD drive, but it does the same.

Tonight I will try it with my external HD that has Tiger OS X 10.4.11 (my old "half -dome" Imac PPC's internal HD in an Firewire enclosure). Does anybody know how to boot up from an external HD?

I have a feeling it won't make a difference, since presently, it looks like it only get's to the part of checking wether there is RAM memory, it does not recognize the keyboard. if you have any suggestion, you can email me as well:

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Jason will be eternally grateful.
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