PowerMac G5: Blinking question mark at startup

I have a 3 1/2 year old G5. When I boot it up, it goes straight to the blinking question mark. I've reset the PRAM, no change. I've tried booting off an installation disk. That gets me to the Apple logo, then the logo pixels go kinda funky and it freezes. I don't hear the hard drive at all during this process; it does not spin up. The CD/DVD drive is obviously spinning, but as I said, it won't boot off an installation disk (I tried three different disks).
I'm assuming the hard drive is bad, but I don't know. I've never had a problem with a Mac before! Does anyone have any suggestions? I don't think of a 3.5 year old Mac as being that old, but I'm a bit nervous about dropping a new hard drive in and wondering if I should just get a new system.
ETA: I have disconnected all peripherals and restarted, and that made no difference.
Message was edited by: Stacia Seaman

I'm having this same problem with a system I just replaced a logic board in. Won't boot off of HD or CD. The HD that is in it is a brand new drive from a different power-mac (the HD from the dead box was moved to the new powermac to get that user back online) so it should be ok, but regardless of that, it won't boot of CD/DVD either.
I guess I don't have anything useful to add. Just a "you're not alone with this problem". If I come across anything that helps, I'll let you know.

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