Light comes on briefly but won't start up

I blew the circuit breaker last night with the A/C and now my PMG4 MDD won't turn on. The power switch illuminates when pressed and held, but goes dark as soon as released and the computer doesn't start. Please tell me this won't cost me more then the A/C unit I bought to help protect the computer from the 90 degree heat and humidity in Chicago. Thanks, Tim

If you have tried all the recommended resets and changed or tested the battery, then this points towards a failed power supply. There are a few threads about this on here - here is one example: http://discussions.apple.com/thread.jspa?threadID=958170&tstart=0
G4 MDD 1.25 dual Mac OS X (10.4.9)

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http://docs.info.apple.com/article.html?artnum=302538
Also you may want to check this out:
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If you are able to use a multi-meter, you can test to see if the power supply is culprit. Use the Power Mac G4: Power Supply Voltage Test (Sawtooth G4) document to aide you in the proceedure.
If not the Sawtooth, Power Mac G4 (Gigabit Ethernet): Power Supply Voltage Test.
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http://www.xlr8yourmac.com/tips/MDDps_mods/MDD_PSMods.html#update
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http://www.jcsenterprises.com/Japamacs_Page/Blog/D275729F-09DA-4FBB-96B3-BEEEB2C 04619.html
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http://support.apple.com/kb/ht1939
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