SDtart from external disk

I have a 21 inch iMac Late 2012.  I cannot start from any of the external disks, using the Option key or setting the startup disk in prefs. Any way to force the iMac to resart from an external disk?

I'm thinking that maybe his external hard drives partition is not set to "GUID Partition Table" ....?

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    Message was edited by: sthmtc

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    This question was solved.
    View Solution.

    WaliN wrote:
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