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<blockquote data-quote="krs" data-source="post: 1878672" data-attributes="member: 67742">It sounded from your first post as if you had two separate drives, not a single drive that was partitioned.I think one potential problem may be that Mojave uses a different file system than Mountain Lion - not sure how that plays on a partitioned drive. In my case with Mojave and El Capitan, I have two different physical drives, one is a spinner and the other an SSD. The spinner uses HFS+, the SSD APFS.So....for the last &quot;problem&quot; which isn't really a problem, the partition with Mojave on it won't show with Mountain Lion since ML can't recognize the new APFS file system.On how to resolve this issue....hmmmmI let someone else comment.PS: Have you tried going back to the original video card and holding down the option button while booting?I think that should bring up both macOSs if it did before.</blockquote>

[QUOTE="krs, post: 1878672, member: 67742"] It sounded from your first post as if you had two separate drives, not a single drive that was partitioned. I think one potential problem may be that Mojave uses a different file system than Mountain Lion - not sure how that plays on a partitioned drive. In my case with Mojave and El Capitan, I have two different physical drives, one is a spinner and the other an SSD. The spinner uses HFS+, the SSD APFS. So....for the last "problem" which isn't really a problem, the partition with Mojave on it won't show with Mountain Lion since ML can't recognize the new APFS file system. On how to resolve this issue....hmmmm I let someone else comment. PS: Have you tried going back to the [B]original video card[/B] and holding down the option button while booting? I think that should bring up both macOSs if it did before. [/QUOTE]

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