G4 won't reboot

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I probably did a foolish thing, I was trying to open 2 flash drives at the same time while updating my OS. My processor has been acting busy lately, so I should have know better.
The screen froze, so the only thing I could do was shut down manually. I have tried starting with Option Command P R, Opt. Cmd. O F, nothing seems to work. I had the battery out for over a day, I left it alone for a week. No change.
The computer is a Powerbook G4 with 1.5 ghz processor and Leopard OS. Anybody have any ideas other than giving it over to a Mac tech?
I should add that when I turn on the computer it sounds like the fan or the harddrive is running, and the screen is black.
 
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So when u power on do you hear the chime? What happens if you power on and hold down the T key - does it go into Target mode? if so you will see a firewire symbol move round the screen.
 
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M
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No, the chime hasn't really been sounding for awhile. Hold down the T key while pressing power, or after? It doesn't seem to do anything.
 
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No - power on by pressing button then hold the T key.
 
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Ok - try inserting install disk and holding C key to boot off that disk.
 
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its a laptop. cant get the disk to load while its like this.
 
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Is there a way to get a disk to go into the laptop in this situation?
 
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If it wont take a disk - is there one already in the drive? If so power on and hold down mouse button and it should pop out.
 
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The computer doesn't really seem to be doing anything other than running its fan. when I put a disk in, it doesnt pull it in or push it out or anything. And no disk pops out.
 
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im having the same issue. powerbook g4 turn it on and you hear the fan or what sounds like it but i get the chime and as far as the blue screen then it stays there. it starts in safe mode when you hold the shift key at start up but i dont know what that does and you cant go on the internet that way. dont mean to jack your thread but our problems sound similar.
 
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This is the second time it has happened. Before I was able to use one of the option command tricks to get it to respond. This time nothing.
 
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Do you have a bootable back up copy of your HD. if so connect it by firewire and power on then hold option key and select the Ext HD to boot off.
 

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