MacBook won't read new internal hard drive
I recently bought a new internal hard disk to my MacBook. I followed the instructions in the site MacBook Pro 13" Unibody Mid 2012 Hard Drive Replacement and managed to replace the hard disk correctly but the MacBook does not recognize it. When I turn on the MacBook with a new hard disk is showing a sign of a folder and a question mark, when I turn on the MacBook with the old hard disk is working but the disk is not right.
The old hard drive:
Toshiba, 750 GB, 5400 RPM, SATA
The new hard drive:
Could you please help me?
Thanks in advance.
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Is this a good question?