I need to restore an external backup on my macbook pro but the "command R" function isn't working at startup. What do I do now?

I've had a bunch of things replaced on my macbook pro, which meant that the hard drive was wiped. I did a full backup on an external hard-drive but now I can't restore it. Apparently I need to press Command and R upon startup (when the grey screen appears) but I've tried this numerous times and nothing happens. Any help would be g

Try restarting holding the option key for the startup manager
MacBook Pro (15-inch Mid 2012), OS X Mavericks (10.9.5), i7 500GB 16GB RAM iPhone5 iOS8.0.2

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