G5 Shuts down and immediately restarts

I started having this problem after upgrading to 10.4.6. When I shut down or sleep, the G5 immediately restarts. Tried unplugging the power cord and waiting for a minute and removing all the peripherals, but I'm still having the same problem. Any ideas?
G5DP 2.0   Mac OS X (10.4.6)  

Dear Sally,
I understad that the issue at times occours just after the update. This is usually because certialn filesand permissions chage over time when installing a software . When an update runs certian permissions and files are overwritten or updated. During this action a damaged file becomes inoperable due to which a user faces different issues.
If the issue persist make a back up of all your network setting and
1.Drag the whole system configuration folder from the location
HDD > Library > Preferences > SystemConfiuration folder ----> to the desktop.
2.Thendrag the the user caches in the trash and empth the trash
Location :
~/Library/caches
3.Restart the unit holding the "Shift" key to boot to safe mode. Then restart normally and check.
4.If this fails make a new admin user and check. If that dosent work either then backup your data and perform Archive and install without preserving user and network setting.
Hope this helps.
Good Day!
Ravi Dimri.

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