Macbook wont boot from new hard drive.

I installed a new Western Digital 500GB hard drive into my Macbook Pro (2006 edition). The computer boots up, but it just stays at the screen with the apple and the thing circling underneath it. It won't go any further than that. I have to boot from my external hard drive to get to the Operating System.
Also it won't shut down nor restart unless I hold down the power button.
I installed Snow Leopard 10.6 on the new hard drive. The longest I waited was like 10 minutes. Should also note that there is a CD stuck in my CD/DVD optical drive (I used an external drive to install snow leopard)...I don't know if that's interfering. It didn't interfere with my old hard drive.
I've also used Disk Utility. It says the disk needs repairing, so I repair it, and it says successfully repaired, but I can't shut down or restart the computer, so I have to shut it down by holding the power button. When I turn it back on, it says it needs repairing again. Maybe it's not saving because of the improper shut down?
Please help

Welcome to Apple Discussions!
Did you format the new drive before trying to install the OS?
http://discussions.apple.com/thread.jspa?threadID=1885474&tstart=60
Try that, and if still no joy, you might have a defective drive. If so, WD will replace it under warranty.
Good luck!

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