Black Screen on start up, no chime, fan immediately overdrives, no response

I've got my friend's Powerbook G4 12" 1.5GHz. She said that she left it running the other night, went to bed, then in the morning the screen was blank/black, and the fan was in overdrive. I searched Apple discussions for days trying to find similar issues and/or cure. I found some similar problems, and tried a few things... I tried to reset the PMU, to no avail. I tried booting from the install disc, but it just does the same thing every time: Black screen, fast/loud fan.
I've seen some responses in similar threads say that it could be a logic board issue, perhaps it's completely shot for some reason.
I even (out of pure curiosity and a strange fascination for taking things apart) partially disassembled the PowerBook (using a guide from PowerbookMedic.com) to see if there was anything loose, or any connectors out, or whatever. Reassembled it, and still the same problem.
Any ideas? Or does anyone want to confirm that it IS indeed a bad logic board?

Hi,
When you tried booting from the install disk, were you holding down the C key???
This might be a bad video card. What concerns me most is the fan. That is usually a sign that there is a process taking a huge amount of the CPU. The only way to see that information is to be able to boot the machine to the Desktop, launch either Activity Monitor or the System Profiler/Startup Items and also, if you can get it booted, the system logs are there also. They can shed light on the situation.
If you can't boot from a restore disk I think your only hope is an Apple store or Apple reseller. Using another Mac, you might be able to access the hard drive using Target Disk Mode:
Transferring files between two computers using FireWire
You can use FireWire to connect your computer to another Mac and have one of the computers appear as an external hard disk on the other computer. This is sometimes called Target Disk Mode.
To transfer files using FireWire:
Shut down the first computer and leave the second computer on.
Connect the two computers using a 6-pin to 6-pin FireWire cable. (If both computers have higher-speed FireWire 800 ports in addition to the standard FireWire 400 ports, you can use a 9-pin to 9-pin cable with the FireWire 800 ports to transfer data at higher speeds.)
Open System Preferences, click the Startup Disk, and click Target Disk Mode. (Or, start up the first computer while holding down the T key.)
A disk icon for the first computer appears on the desktop on the second computer. Drag files to and from the disk to transfer them.
When you finish, eject the first computer's disk by dragging its icon to the Trash. (While you drag, the Trash icon changes to an Eject icon.)
Push the power button on the first computer to shut it down and disconnect the FireWire cable.
If the computer to which you connect your computer is running Mac OS 9, it must have FireWire version 2.3.3 or later installed. Use Apple System Profiler (located in /Applications/Utilities) to check the version of FireWire installed. If it has an older version, get an update at the Apple FireWire website at www.apple.com/firewire.
Carolyn
Message was edited by: Carolyn Samit

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