So a simple hard drive change renders a Mac useless?

So I opened up my 2006 MacBook pro to change the harddrive harder than on my 2010 model but none the less doable. Do everything right try to turn it on lo and behold it does not work and the MagSafe is blinking orange with some repeated clocking noises from the power slot. Wow I have just lost respect towards apple. Am I screwed or is this something I can fix?

The computer boots up using the operating system installed on the hard drive, (even a Mac). No operating system, no work . You need to reinstall the O/S on the new drive.

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