How check out a used G4?

[J.A.B.]

I am buying my first Mac this week, a G4/400.  Looking
for advice on how to check out this machine--steps to
follow, what do I check out, etc. 

1.  Are there built in utilities in OS X that would
run through and check my hardware and software (hard
drive, video card, etc)? 

2. Any good shareware (preferably) or commercial
products that would test out this system? 

Thanks, 

Jeff


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