G4 won't turn on--button briefly lights, but it won't start-up?

Mac G4 won't power-up-----start button briefly lights and it briefly makes noise like it is going to start-up, but nothing happens. Any suggestions?

Could be something simple like a weak PRAM battery, or a more serious problem like the power supply.
Your internal PRAM battery may be weak or discharged. Suggest you replace the battery. Check this site for battery part numbers and sources. https://sites.google.com/site/macpram/mac-pram-nvram-cuda-pmu-battery-tutorial Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
Try Resetting the Logic Board
Resetting the logic board can resolve many system problems. Whenever you have a
unit that fails to power up, you should follow this procedure
before replacing any modules.
1 Unplug the computer.
2 Press the Power On button on the front of the unit.
3 Open the side access panel.
4 Remove the battery from the logic board.
5 Wait at least 10 minutes before replacing the battery.
6 Make sure the battery is installed in the correct +/-
direction.
7 Reassemble the computer and test the unit.
*Resolve startup issues and perform disk maintenance with Disk Utility and fsck*
http://docs.info.apple.com/article.html?artnum=106214
*Your Mac won't start up in Mac OS X (Mac OS X 10.3.9 or earlier)*
http://docs.info.apple.com/article.html?artnum=106464
*Troubleshooting: My computer won't turn on*
http://docs.info.apple.com/article.html?artnum=300552
*Power Mac G4 Resetting the PMU on the Logic Board*
http://docs.info.apple.com/article.html?artnum=95037
*Resetting the iMac (Flat Panel) Power Management Unit (PMU)*
http://docs.info.apple.com/article.html?artnum=95165
 Cheers, Tom

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G4 won't turn on--button briefly lights, but it won't start-up?

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