Macbook Pro Stuck at Gray Screen When Entering Boot Options

Hello apple community,
I have a 15 inch MacBook Pro 2008, and I decided recently to replace the 250 Gb hard drive with a new WD Black 500 Gb hard drive. I backed up all the data onto my external hard drive and replaced the hard drive. Now I am trying to enter the disk utility to boot from the disk utility by holding the option key. When I turn on the computer and hold the option key it gets stuck on the gray screen. Does anybody have any idea why this is happening? Thanks.

OK. When you say it doesn't work does that mean you cannot see the drive in Disk Utility? Of course that means you need to boot from another drive such as your external backup. If you happen to have a Snow Leopard DVD to boot your computer then you could try with that. But there isn't much you can do if you don't have another bootable drive in an external enclosure or other form of hookup like a universal drive adaptor.
Your model is not new enough to use Internet Recovery. I don't know what more to offer. You cannot even verify that the new HDD is OK by putting it in an external enclosure.

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