G5 won't boot into Leopard

Hello everyone,
I've got a weird issue with my PowerMac G5 and Leopard. My 11 year old was experimenting with the GUI, and it's possible that he ended up interfering with the online OS update, or something along these lines (I wasn't there to see what he did). Or maybe it's a totally different issue. Right now the G5 won't boot. When powered on, it chimes, displays the large brown-ish apple, and stops dead in its tracks. I've tried unplugging it for 5 minutes, pushing the PMU reset button, resetting PRAM, but haven't made much progress. Same result when trying to boot off OS X DVD. When it was working, I noticed that it was having trouble keeping time, I thought the CMOS battery may need replacing soon. Can a dead battery be causing this issue, even after all the resets? When the apple is displayed, does it mean it tried booting the OS and failed, or did it not even get that far? I don't hear any sounds coming from the hard disk. Another oddity: about a minute after it's been powered on with the apple still up on the screen, it starts to sound like a jet engine spooling up. It's a gradual increase in fan RPM (power supply fans also) to the point that it becomes VERY loud and sounds like it's about to blow up. What's going on here?
Thanks in advance for any ideas / suggestions.

I have more info... I was able to get the G5 into the boot device selection screen; when I tell it to boot off the hard disk, I hear the hard disk chirp, the G5 throws up the apple screen, and everything goes dead.
I also booted into the OpenFirmware (as suggested in another forum), and ran the reset-nvram command, followed by reset-all. Now when it boots into the device selection screen, I don't see the DVD at all anymore!
Thanks!

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