IMac G5 bootup with fan noise but no display

Hi all the experts out there,
I'm new to iMac and need help to resolve the following issues:
1) My iMac went on sleep mode and follow by a big fan noise.
2) Able to power down but when I press the power button follow by the Command, Option, P and R keys, no response from the iMac (no screen display but power indicator is lighted)
3) Anyway to eject the Disc manually from the slot? By pressing the eject key from the keyboard does not eject my CD. I'm trying to eject the music CD from the slot, so that I can put in the system disc to try on other mode of recovery.
Any help is welcome.

http://docs.info.apple.com/article.html?artnum=58566 iMac (Slot Loading): Troubleshooting CD/DVD Eject Failures
http://docs.info.apple.com/article.html?artnum=106752 Macintosh: How to Eject a Disc When Other Options Do Not Work

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