Depends if you've saved the back-up as a bootable image, I guess.
Usually hitting F8, or F2, while the computer is starting will bring up the menu in which you can alter the sequence of inputs which the machine will use to boot.
I always make sure mine is set to CD/DVD optical drive as first, as that's how my emergency recovery data is held.
If you have set the hard drive as first option and that is the problem it will not normally boot up.
Last edited by: Roger. on Thu 19 Mar 15 at 10:35
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