I have a powerbook G-4 15 inch, It wont boot up and the display only works on the first try. it gets to the apple screen and freezes, when i try to restart theres no display. Help please, whats the issue here?

I left it running over night, it was running perfectly, in the morning the screen was black. i tried to restart it and got no display but i can hear the machine running. so i put away for several months, plug it in, charge the battery, it boots, i have a display, it loads the desktop and freezes. when i try to restart it theres no display. the last time i tried, i started it, i got to the apple screen and nothing. whats the issue here? please help.

Will it boot OK in Safe Mode? See What is Safe Boot, Safe Mode? (Mac OS X)
http://docs.info.apple.com/article.html?artnum=107392 Takes a while to run, but it usually "fixes" problems.
Safe Boot takes longer than normal startup
http://support.apple.com/kb/TS1884?viewlocale=en_US
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
http://docs.info.apple.com/article.html?artnum=106214
 Cheers, Tom

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