Loud popping sound and then nothing

Everything was working beautifully then suddenly I heard a loud popping sound and the screen went black and the computer was dead. I turned everything else off, waited about thirty seconds and tried to turn it on. When I press the on button it lights up but nothing else happens.
Any thoughts?
G5 Mac OS X (10.4.9)

Hi, and a Warm Welcome to the Power Mac G5 Forum!
Well - a loud pop was the classic symptom of a blown Power Supply Unit.
Not sure which G5 you have... but if it's a "Late 2005" dual-core
http://support.apple.com/specs/powermac/PowerMac_G5_Late2005.html
then it should be fixed under this
http://www.apple.com/support/powermac/powersupply/repairextension/
If you have an earlier G5, please post again. Good Luck.

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Loud popping sound and then nothing

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