strange problem arose

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i have imac 2 external hds. on 1 of hds upgraded mavericks 10.9.5 yosemite. worked fine.

needed scan scanner not supported beyond 10.6.8, went startup discs , selected 10.6.8 system on internal hd.

after scan wanted go yosemite, no longer shows startup disc. disc utility says yosemite partition fine.

appreciate ideas.
 

set boot ever partition/disk want in setting>startup disk
 


Forums Macs macOS OS X Yosemite (10.10)


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