Early 2011 model, A1278 / 2.3 GHz i5 or 2.7 GHz i7 processor.

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Installed new HD not showing up

Hi Guys, I have installed the new 500 GB hard drive into the mac book. During the start up, it goes to triangle with an exclamation point -1007F. Can someone help.

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This is a brand new unformatted hard drive? Are you trying to start up from a gray installation disk other than the one that came with the machine?

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Yes thee other one is not working so i got the brand new hard drive.

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The hard drive you installed is simply a blank drive, it has to be formatted a specific way and needs at least an OS X recovery partition in order to install the rest of the OS onto the other partition. This page may help you: how to make a bootable OS X 10.10 Yosemite Install drive

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Forget the MacWorld guide ;-} Much more confusing than it has to be. Follow my answer here: 1 tb seagate sd hybrid install went well; formatting not so much. Its simpler and quicker.

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