How to start with bootable backup

My iMac power button has "ceased function". but I have a bootable backup on one external drive, and also an additional Time Machine drive. Any suggestions on how to use a loaner iMac while this one is being repaired? i.e. - How do I start up with the bootable backup? Do I then change Time Machine to the bootable backup drive? etc. By the way, I am using OS X Mavericks, which is not listed below.

Option key lets you force booting one drive over another.
However, it may only work from an Apple, MacAlly, or Logitech wired keyboard with Apple's key names on the keyboard.
A non-working power button can though cause unpredictable results, such as the machine shutting down on its own, or restarting on its own.  Have the PRAM battery checked as that often can fix a non-working power button.
Ages ago, Apple made keyboards with their own power button for the computer.  These may or may not work on newer machines.  I'm not sure of that, but it is worth a try if you can find one that has it.

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