Grey screen with apple logo after new HDD install

I have a mid 2010 iMac A1312, this was given to me recently with the knowledge of its bad HDD, so I bought a new HDD. I followed step by step instructions on how to replace a Hard drive and I did. I switched the computer on and inserted my Snow Leopard 10.6.3 install disk and clicked the icon. It is now at a light grey screen with a dark Apple logo. I have waited about ten minutes and restarted the machine. Ive tried all variances of startup holding down c, option, command r and so forth. Currently I am going to give it a good long wait of 20 minutes or so  and see if I was just being impatient and not allowing the install software chance to start up. But in the mean time... any suggestions? I have read I need the original disks that came with the computer from factory to get a new HDD going. Is this true? thank you for your time!

it has now been 30 minutes and no change. I still have the grey screen with apple logo. please help

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    Resolve startup issues and perform disk maintenance with Disk Utility and fsck
    * Last Modified: June 25, 2009
    * Article: TS1417
    * Old Article: 106214
    [Email this article]
    [Print this page]
    Symptoms
    If your computer won't start up normally, you may need to use a disk repair utility to fix the issue. Mac OS X includes two utilities for this—Disk Utility and fsck (a command-line utility). You can also use these even when your computer starts just fine but you want to check the disk for possible file system issues. For Mac OS X 10.4.3 or later, check out "About live verification in Mac OS X 10.4.3 or later," below.
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    3. Click the First Aid tab.
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    Te second article entitled "Troubleshooting Startup and Login Items" identifies troubleshooting that should be carried out in safe mode. However I am unfortunately unable to start in safe mode and have not been able to progress past the apple logo since this problem started.
    Thank you for both links and for taking the time to share. If though I have missed something more significant in this regard I would appreciate your feedback.
    Many thanks 

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  • Macbook won't boot past grey screen with Apple logo and spinning wheel.

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    Hi ds,
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