iBook g4 turns off randomly

matteo_man

Registered
I have an ibook g4 running Tiger and it has started to turn the display off on its own making it look as though the mac has shutdown? When I turn it off by holding the power button and turn it back on again (this is the only way to restart it as the screen is black) the fan makes a loud noise but it fails to boot up. This happens several times before it eventually restarts and then it turns off again randomly???

Help!
 
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