HT1758: How to identify iMac models
Learn about How to identify iMac models
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Sep 30, 2013 7:21 PM in response to Tvirusby babowa,Generally, it is best to add RAM in matching pairs; having said that, it could be that the module is defective or not seated correctly.
What brand is it and does it meet the exact specs needed for your model?
And, there were some Macs which would not boot under certain circumstances:
http://support.apple.com/kb/HT1423?viewlocale=en_US
FWIW, we are talking about GB of RAM, not MB......
