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wont boot up after powering on

When i power on my ibook 12" g4 30gb laptop the screen stays a light blue color and the gear wheel just spins round and round and the hard drive makes a loud humming noise! Wont boot up! thanks!

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Boot from your system installation disk. "C" key. Go to the second screen pull down menu to Disk Utilities and format the drive, then install a system.

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Use Disk Utilities and format it.

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