Mac won't start after installing Mountain Lion

After installing Moutian Lion (from 10.6.x) overnight I returned home yesterday evening and wasn't able to start up the mac.
I get the white screen of death and a little spinning wheel and then the mac shuts down.
I tried rebooting in recovery mode and did a "repair disk".....it said that it couldnt repair the disk.
I tried the "reinstall the OS X" option but the two drives it showed me are both locked so I couldnt do that either!
I didnt have time to do anything else.......what do I need to do now? WHat are the next steps? Sledgehammer? Dynamite?
Thank you
HMHB

Thanks Arthur,
Point 1 sounds scary and expensive!
thanks for the link I will try some of these when I get home and will report back.
HMHB

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thanks for the link I will try some of these when I get home and will report back.
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Thanks Arthur,
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thanks for the link I will try some of these when I get home and will report back.
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Bucknut wrote:
and also have run my Mac Keeper program as well.
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Pete

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Hi,
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*I tried entering a manual DNS*
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Message was edited by: Carolyn Samit

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Sigh.

Mac won't start after installing Mountain Lion

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