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Mar 3, 2016 5:50 AM in response to caddidaddiby Loner T,1. If Windows is bootable, please install https://sourceforge.net/projects/gptfdisk/ and post a screen shot similar to the following.
2. If neither OS works, use How to install OS X on an external drive connected to your Mac - Apple Support to install OS X on an external disk. Upgrade the OS X version to match the current version on the internal disk and then we can diagnose further.