I have a Powerbook G4 series which i have been using for a while now. It has OS X snow leopard installed in it. The problem i am facing is whenever i try to re-boot my mac, it shuts down. When the system is rebooted, the fan starts but there is no start up chime. This continues for about 5 secs and the system shuts down with a loud beep. After attempting to reboot many times the system boots once. Please suggest some solution about the issue.
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