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well, the power supply is more complicated than just works or doesn't.
ATX power supplies put out three different voltages, any one of which can go bad.
of these we have:
12volt = usually 2 branches internally, of which either can go bad. this is the most powerful branch. and the least likely to fail. your fans almost always run from this 12volt.
5volt = usually only one branch internally, this is a less powerful branch, and can oftentimes become overloaded. this will cause the CPU to not power up.
3.3volt = usually only one branch internally, this is the least powerful branch, but usually has the least load. this branch failing is rare, but will also cause the CPU to not power up.
this doesnt even mention some power supplies with odd voltages, but this covers them all in some respect.
so what i am getting at is many times i see machines power up but not post, and it turns out to be a dead 5 volt or 3.3 volt branch. (remember, not all power supplies check for a load on all branches before powering up, so some will still start when half dead.)
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