Can't get 4GB RAM Upgrade to work in 2.8GHz iMac

I bought two 2GB RAM Modules @ Frys to replace the 1GB in my 2.8GHz iMac 24". It was a Mac Refurb bought from their store. When I put in both 2GB, it won't boot up. It will boot up with one 1 and one 2, for a total of 3GB. Both are running @ 667 MHz, however the 2GB is a Crucial and they say I should run part # CT817145. http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=39D3BF46A5CA7304
What I got from Frys is part # CT25664AC800. http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=F4042F1EA5CA7304
Crucials site shows the specs to be the same at first glance.
I swapped slots all around and still no dice, it won't start with both 2GB's.
So why is it booting from 3GB and not 4GB?
Can anyone be of help besides taking both back and getting the part number Crucial says, even though the specs appear to be similar.
Thank you so much!

Hello cwinkler
Use this first article to identify exactly which iMac model you have:
http://support.apple.com/kb/HT1463?viewlocale=en_US
The following article's are the iMac Spec's for the mid 2007 and Early 2008.
http://support.apple.com/specs/imac/iMacMid2007.html
http://support.apple.com/specs/imac/iMacEarly2008.html
To me it's sounds like you have a Mid 2007 2.8GHz that uses PC2-5300 667GHz, only the Early 2008 models use PC2-6400 800MHz ram.
Dennis

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Please respond to
[email protected]
To
jsb152 <[email protected]>
cc
Subject
How can I get my web cam to work in Adobe Connect ?
Re: How can I get my web cam to work in Adobe Connect ?
created by MosesJOI in General Discussion - View the full discussion
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