My imac desktop wont boot up there is the logo and the timer pls help

my imac desktop wont boot up there is the logo and the timer pls help

What model iMac do you have and what operating system are you running? By Timer are you referring to a progress bar?
Mac OS X: Gray screen appears during startup - Support - Apple
Resolve startup issues and perform disk ... - Support - Apple

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    If your running Snow Leopard or earlier OS X, pop in your Install DVD and startup holding either the Option or C key, then open and use Disk Utility to repair the Macintosh HD.
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    If it does work, then read this article...
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