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Apple Computing Products:
macOS - Desktop Hardware
Best Online Mac Repair service
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<blockquote data-quote="rexk" data-source="post: 1568969" data-attributes="member: 243284"><p>New question.I was able to restore the system to 8gb RAM. I've determined that the upper riser holding 4 2gb memory cards does not get read by the logic board (a red light that lights only briefly upon opening on the lower riser stays lit on the upper riser); the lower riser with its 4 cards are now functional. I have removed and swapped risers in all configurations to confirm that all RAM and both risers are OK. Before ordering a replacement logic board, does anyone know of anything I can try to restore reception of the upper riser in the logic board? That would re-establish the 16gb RAM which are available.</p></blockquote><p></p>
[QUOTE="rexk, post: 1568969, member: 243284"] New question.I was able to restore the system to 8gb RAM. I've determined that the upper riser holding 4 2gb memory cards does not get read by the logic board (a red light that lights only briefly upon opening on the lower riser stays lit on the upper riser); the lower riser with its 4 cards are now functional. I have removed and swapped risers in all configurations to confirm that all RAM and both risers are OK. Before ordering a replacement logic board, does anyone know of anything I can try to restore reception of the upper riser in the logic board? That would re-establish the 16gb RAM which are available. [/QUOTE]
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Apple Computing Products:
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Best Online Mac Repair service
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