It's a 2009sounds like the drive is not connected properly or has some strange formatting on it. Sounds like you are installing a 2nd HDD, so I suspect wrong cable or wrong disk type.
hard drive works fine on my windows pc, doesn't work on macbook pro. I figured the cable is bad.try to see if the HDD works on some other pc, if it works its fine, the problem then is on the notebook, either cable or mobo
Where is it installed? If you installed it in the primary drive you may have not gotten the connector snuggly in there. You can try making sure it's in there and if it still doesn't work you could try getting a usb sata adapter (some HD come with one) and plugging it into another computer to format it.I installed a hard drive in a macbook pro but the hard drive isn't showing up when I try to do a fresh install, what needs to be done?