Macbook Pro Stuck on Apple logo after hard drive switch.

You shouldn't do stuff like this when you don't know what you are doing. Please put the original drive that came with your new MBP back into it. Depending upon what you may have messed up, you may still have a Recovery HD, so try booting from it:

Boot Using Command+R keys:

1. Restart the computer.

2. Immediately after the chime press and hold down the

"COMMAND" and the "R" keys together.

3. Release the keys when the Utilities Menu appears.

If you get this far, then do this:

Install or Reinstall Mavericks, Mountain Lion, or Lion from Scratch

Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.

OS X Mavericks- Erase and reinstall OS X

OS X Mountain Lion- Erase and reinstall OS X

OS X Lion- Erase and reinstall Mac OS X

Note: You will need an active Internet connection. I suggest using Ethernet if possible

because it is three times faster than wireless.