Mac won't start after downloading Mountain Lion

Downloaded Mountain Lion today ,when I restarted my IMac it won't reboot . Screen shows a circle with a line through it . Please help

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 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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    Point 1 sounds scary and expensive!
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    HMHB

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