![]() ![]() ("Bless" is how OS X sets volume bootability.) ![]() So now it thinks the Main partition is the bootable partition when it should be the ESP. So how did these get mixed up? Moving the drives forced OS X to rescan the volumes to determine which partition is the bootable partition, and unfortunately it "blessed" the wrong partition. If your Mac mistakenly thinks that the Main partition is the bootable partition, you'll get a long delay at bootup followed by that black screen with the no bootable device message. If you did a Win10 upgrade from Win7/8 instead of a clean install, you have a 4th partition located after the Main partition that is a second Recovery partition. Your Windows drive has at least 3 partitions: EFI System Partition (ESP), Recovery, and Main. Unfortunately it took me months by myself to figure it out. I had this problem and I couldn't find anyone that knew anything. ![]()
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