How to reinstall Mac OS Snow Leopard?

Hi,

Yesterday I tried to install Mac OS X 10.6.3 update in my Snow Leopard, I made the download of the package about 476 MB through System Update and it installed the package, but at the end of installation I got an error message: "There was an error, the installation was not completed" and my mac restarted and now it's just in the white screen with Apple logo and the loading icon.

I tried to boot with the Snow Leopard DVD and nothing happens, just the white screen. How can I reinstall the system or fix this?

Thank you
marcoloppoAsked:
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FieryhailCommented:
Two possible ways to go about this.  To load your Mac from the DVD (Snow Leopard) that is in the drive, restart your Mac and hold the "c" key.  This will force your Mac to boot from the optical drive.  If you want to see what bootable systems are on your Mac, then press the "option" key during a fresh restart and it will show you any bootable volumes and give you the choice from there.  Hope this helps.

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marookCommented:
Or, if you have another Mac near by, [manually] download the Combo Update from Apple's site, boot your Mac in Target Mode (hold T while booting) and install it from the other Mac.
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strungCommented:
First try rebooting while holding down the shift key
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strungCommented:
This article suggests unplugging all external peripherals and rebooting holding down the shift key:

http://reviews.cnet.com/8301-13727_7-10471649-263.html?tag=mncol;title
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marcoloppoAuthor Commented:
I got the boot pressing option button and I got reinstall the system, thanks.
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marcoloppoAuthor Commented:
Tks to all your replies.
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