I have a mavericks iMac with Fusion drive. I use an external SSD to test new O.S. from Apple before to do a real upgrade, A few days ahead I tried install HS to the external drive, After that My internal Fusion Drive was spliced and there is no way to boot it up. Any solution ? Seems that both of them are not corrupted and need only to be re-paired.. Thanks in advance Mak

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