IBook won't power on, but the fan is running top speed

hy,
just got back an iBook from the Apple Store and now it won't turn on..the screen stays black but the fan (at least it sounds like a fan) keeps running quite fast and loud.....any help would be greatly appreciated
neil

sad thing is the logic board was just replaced (within the last week)...not cool
oh well, thanks anyhow, at least we won't spend time waiting for it to power on

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IBook won't power on, but the fan is running top speed

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