Bank 1 memory does not recognize RAM. I tried different brands of ram OWC, Crucial, Kingston, micro" nothing works. The other memory bank is perfect, no matter what brand or what capacity the second bank works. How can I fix Bank 1 memory in Mac Mini 2012 to recognize RAM?
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Sadly there is very little you can do here. You can try to clean the modules slot using some can'ed air or some spray cleaner.
But, be careful with the cleaners! Many have oil in them which you don't want. Spray the cleaner onto a piece of clear glass to see if it leaves a residue if it does don't use it!
For the modules you could try using a pink pencil eraser following the contacts (not across).
If this is the same system that has bad USB ports you might want to look at just replacing the logic board.
Sorry ;-{
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