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A possible fix for a highly unstable G3 or G4 Tower
Authored by: Arturia on Sep 08, '05 09:13:34AM
Here's the correct procedure that I've found somewhere on internet

Many system problems can be resolved by resetting the PMU chip.
Whenever you have a unit that fails to power up, follow this procedure before replacing any modules:

1. Disconnect the power cord and check the battery in the battery holder
The battery should read 3.3 to 3.7 volts.
If the battery is bad, replace the battery, wait ten seconds, and then reset the PMU (refer to the next step).
If the battery is good, go to the next step.

2. Press the PMU reset switch (S1) once on the logic board and then proceed to step 3.
Do NOT press the PMU reset switch a second time because it could crash the PMU chip.

3. WAIT ten seconds before connecting the power cord and powering the computer on.

4. Run Apple Hardware Test.

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