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Helpful answers
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Dec 23, 2015 4:33 PM in response to nelliedoodleby OGELTHORPE,★HelpfulWhat brand RAM did you install and what are the EXACT RAM specifications.
Take out the RAM and install one module individually in each bay and see if one module is defective or one bay is defective.
Run an Apple Hardware Test:
https://support.apple.com/en-us/HT201257
Note that an error free AHT is not definitive.
Ciao.
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Dec 23, 2015 4:35 PM in response to OGELTHORPEby nelliedoodle,Tried one at a time and I was getting 4 GB, then I put both in since both were working in each slot and when I turned it on it showed 8 GB in about this mac!
Thank You!