Post originale di: Rany ,
I would remove the target HDD from the case, put it in an enclosure, plug it into my MacBook Pro, then examine it using Disk Utility. I'd look for odd partitions for example, the sort some people cause when they install Windows on a Mac using 3rd party software instead of Boot Camp, or partition the HDD from Boot Camp, etc. that could be causing issues at the HDD level. At this point, it would be possible to verify/repair and plug back into the old Mac. But why bother? I'd format it and restore a working OS from the source HDD plugged into another USB. Then run verify/repair and permissions to check everything is ok. Then install in the old Mac, restart, and test. That's my thought..