G4 won't shut down only restarts

I've been using the comptuer without a battery & it was working fine. There was a blackout on Saturday, though computer was not on at time. Sunday computer worked fine, but printer didn't work. When I went to shut down computer it just restarted.
Bought new battery today. Reset PMU & installed new battery. Started computer with only keyboard & monitor attached. Worked OK & shut down OK. Then reattached perpherials & now won't shut down again.
What should I do? Anyone know what I'm doing wrong? Thanks, Fish

Thanks for the input Hatter. Can you tell me how to do the fsck -fy procedure or tell me where to find the directions?
For the longest time, when I read " fsck -fy" I actually thought the writer was politely swearing. I really have no idea what it is or does, but found some sketetal instructions in the discussions, so tried it. But I don't have enough info to do it correctly.
I am more in favor of reset nvram from inside Open
Firmware
cmd opt of
reset-nvram
set-defaults
reset-all
which I think does a better job dealing or clearing
corrupt nvram or device tree on MDDs and later Macs.
Also, I have no idea what you are talking about, where or how to do it. Open Firmware?? Is this something I open up? where is it? etc.
Now that you mention it, buying a new hub makes sense if your other suggestions don't work.
I hope I hear from you again. Thanks for your help. Fish
PowerMac G4 733 Mgz   Mac OS X (10.3.9)   Epson scanner 3170, Epson printer 820, Ext. HD

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