Recently I noticed the fan running at full speed for quite some time on my 
G4 powerbook 12" 1.33 mhz which I thought was unusual as it did not seem to 
run very long in the past. I checked the activity monitor under utilities 
and discovered that the CPU was running at 100% all the time and the 
activity monitor shows up all green in color.  The computer works fine in 
all ways except that the fan is running most of the time now to apparently 
cool the processor....?  I have checked it many times and even when the 
computer is first turned on the activity monitor still shows the processor 
at 100% and soon the fan will kick in.  I ran the Apple hardware test on it 
and everything passed.  Is this a sign of impending doom? Should I stop 
using it or reduce the amount of time it is running?  Any advice is greatly 
appreciated!
Thanks in advance for all who respond!
Tom

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