Safe Mode Shuts down computer after a few minutes

I am running on a Dual 1.8 GHz PowerPC G5, Mac OS X (10.4.9) - I want to start up the computer in safe mode, by holding down the shift key after the chime, and release it when I see the gray apple. The computer seems to start up in safe mode, fans are loud, taking a while (about 6 minutes), etc... then then computer just shuts off. Any ideas as to what is wrong here. I searched forums and I saw problems like freezing in safe mode, but not one like this.

... and if that doesn't work, then restore from the backups you made before upgrading to 10.4.9.
MacFixit put together an excellent tutorial on 10.4.9, too which covers most all the bases; and MacIntouch has a reader feedback report.
Mac Pro 2GHz 4GB 10K Raptor 23" Cinema Mac OS X (10.4.9) WD RE RAID Aaxeon FW800 PCIe MDD-G4 APC RS1500 Vista

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See -Rotten Apple- articles in both of these threads.
https://discussions.apple.com/thread/4023152?tstart=0
https://discussions.apple.com/message/18700825#18700825
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Michael Lafferty wrote:
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Message was edited by: Epochmaker due to omissions in the text.

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Hi! I salute you all!
First of all I want to excuse my english (it's not my native language)!
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Hello Kavans,
Thank you for the details of the issue you are experiencing with your MacBook Pro. I recommend reviewing the following article for this issue:
Mac OS X: Why your Mac might not sleep or stay in sleep mode
http://support.apple.com/kb/HT1776
Thank you for using Apple Support Communities.
Best,
Sheila M.

Safe Mode Shuts down computer after a few minutes

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