Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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Any way to revive Mid 2007 24" iMac struck by power surge?

I was given a 24" iMac from 2007 for free, reason being the computer had been killed in a power surge. The previous owners had already gotten a new iMac, so I can keep this one. However, I would like to get this one back in working order, despite being 10 years old. From some other guides I have looked at and inspecting the computer, I tried a few things.

  • Reset the SMC (didn't work)
  • Reset the PRAM (also didn't work)
  • Check the diagnostic LEDs (I only got 3 out of 4)
  • Insert some memory (because the memory was removed when I got it)

If I don't get the fourth LED:

  • LED 1, for the trickle voltage from the PSU being detected by the main logic board, illuminates.
  • LED 2, for the main logic board detecting proper power from the PSU, illuminates.
  • LED 3, for the video card (in my case, Radeon HD 2900 Pro) communicating with the computer, illuminates.
  • LED 4, for the computer and LCD display panel, unlike the others, does not illuminate.

Source: iMac Intel 24" EMC 2134 and 2211 Diagnostic LED's

Because LED 4 does not illuminate, I get the SuperDrive initializing, fan powering and spinning, and hard drive power on, but no chime or display. I do not know what is causing my display to not communicate with the logic board, as I have reseated the connectors a few times and got the same results. Because I do not have a Mini DVI adapter to hook up the iMac to an external display, I do not know if it will give me a different result if I hooked up an external display. Also, when I shut off the computer, and then attempt to power it on again while still plugged in a few minutes later, no LEDs appear, and I have to unplug and plug the cord back in to get a response. Long question short, what do you think is causing the fourth LED to not illuminate and give me the no display-no chime problem?

Отвечено! View the answer У меня та же проблема

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Выбранное решение

What happens when you hook up an external monitor to your system?

Does it work?

  • If not the GPU is bad,
  • If it does work then the display and or the inverter are bad.

The rub here is the value of the system is less than the cost of the parts. Also keep in mind this system is limited to 6 GB and El Capitan OS-X 10.11.x

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I do not have the proper adapter to hook the iMac up to, so I do not know if I can get it to work or not.

I'm also aware of the limitations you mentioned: 6GB RAM and El Cap, but then again, I don't plan on using the computer for that much, considering its age and that I have a not too much newer but more capable 2010 MacBook to do everyday Mac tasks on.


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