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

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Replacing iMac firmware chip?

iMac 20" "Core 2 Duo" 2.4 GHz

At this time I have the above machine that will not boot from any device.

When I try to boot, holding the power button down for an extended time, it gives a long beep which indicates the it is in the middle of a firmware upgrade, but if I leave it powered on for a long time the upgrade never completes.

So I think it need to have the firmware replaced (I was messing around with rEFIt when I started to have problems). My question is, how do I determine the logic board serial number so then I will know what type of firmware chip to purchase? Does anyone have any other suggestions?

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john1726, contact places like this one. The companies that Dan is referring to are still around. Your EFI IC will be programmed according to your logic board number.

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OT, Your the man! Thanks!

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Thank you, OT! How do I find my logic board number?

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It should be printed on the board itself something like 820-XXXX Based on your information about what computer you have,it could be a 820-2143-A

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OK, it appears they do not have any in stock at this time based on the A1224 model number.

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There was an outfit that would burn a fresh copy based on your system info for these older systems. I'll need to do some digging to find the info.

All you needed was the specs and the system S/N number. I would point out here the chip is a SMD device so you do need to have the correct tools and techniques to swap it out. This is not easy as the neighboring components can can damaged if you don't do it correctly.

Your other option here is a whole sale swap out of the logic board. Then you might be able to gain a little performance improvement in the process.

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Thank you for the feedback! Did you happen to find out what the name of that company is that would burn me a fresh firmware?

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john1726 will be eternally grateful.
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