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Model A1225 / Early 2009 / 2.66, 2.93, or 3.06 GHz Core 2 Duo processor

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Where is the cmos battery in my I Mac

How to replace the cmos battery in IMac

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The CMOS battery is on the logic board. You need to follow the instructions on logic board replacement, and it is a quite difficult task.

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@hughhhandford - In fact replacing the PRAM battery is quite easy in this series! All that’s needed to do is lift off the front bezel assembly and the battery is just under it!

Block Image

Follow the first 6 steps from this guide iMac Intel 24" EMC 2267 CPU Replacement

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Lol I didn’t realise it was this model when I wrote the answer.. I thought it was one of the newer 21 or 27” models

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Hugh H Handford crwdns2934231:0crwdne2934231:0
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