G5 2Ghz Powermac shuts off at power on, unless I hold the button

G5 Dual 2 Ghz, 4 GB RAM ATI X 800 Xt.
Have had it for almost one year, no problems.
Now when I hit the power button to turn it on, it immediately powers off after chime.
However, IF I hold the power button, it will boot to some firmware prompt wherein I must type "mac-boot" and it boots and runs fine.
HELP!!

Many boot-up issues like that can be solved by resetting the SMU. Follow the instructions on this page for resetting the SMU on your Mac:
http://docs.info.apple.com/article.html?artnum=300341
PowerMac G5 Mac OS X (10.4.6) 1GB RAM, nvidia 6800 ultra, Apple 30" Cinema Display

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