Power Mac Won't Start Sometimes

I am running a power mac G4, lately when I try to start the computer, I push the power button on my display and the light comes on and the fan starts but nothing else, no chime or screen, I have reset the pmu/smu and checked the internal battery, it tested at 3.68 volts. I notice if the computer doesn't start, I turn it off by holding the power button in, then if I open and close the cover, the next time it starts. Help me please.

Texas Mac Man wrote:
It still could be the battery. You need to test the voltage while installed or under some type of load.
Definitely. Best way to test the battery (Apple Service Source method) is with battery in holder, computer off, AC disconnected. Test battery voltage and replace if lower than 3.3 volts.
Have mentioned before that I have an 11-year-old Tadiran that still measures 3.69 volts open-circuit but drops to 0.28 volts with a 150 ohm load across it.

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http://support.apple.com/kb/HT3964
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Power Mac Won't Start Sometimes

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