I have a 750 GB SS Hard Drive that was in my Macbook pro 15", i am trying to install it into my new Macbook 13" and when i power it, the apple sign comes on but stays on that screen. Can anyone tell me what Steps i missed.

I need help trying to get my Macbook Pro 13 to bootup.

The software that comes from the factory, pre-installed has always only contained the drivers for that specific model and no others.
If you want to install on a different model Mac, you need to have the original installation DVD or go back to Recovery_HD and download again.
Your 13" and 15" have somewhat different Hardware, and you need the correct version for that model or a purchased or downloaded version to proceed.

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