Disk utility not recognizing HD

Hi,
I have a G4 PowerMac with two 80 GB hard drives. When I boot up the computer, it boots up from the primary drive and runs fine. At this time, both my primary and my secondary drives are accessible and visible.
However, when I boot up the computer using either the Tiger or Leopard DVDs and then run Disk Utility, it only recognizes my secondary hard drive and not my main hard drive.
Also, if I quit Disk Utility at this time and tell it to re-start, it asks me which drive to boot from and the only option is either the DVD or the secondary hard drive. It just doesn't even see my main hard drive. I have to eject the DVD and re-boot for it to boot from the primary drive again.
Any advice?

I can see and use the hard drive only when I boot from it. When I boot from it, it is on my desktop, in my System Profiler, and visible under Disk Utility.
When I boot from DVD, the drive is not visible anywhere - not in System Profiler and not in Disk Utility.
I booted the computer using the HD and did a "Verify Disk". It gave me several errors and one in red that told me I needed to do a disk repair. I did a disk repair by booting the computer into Safe Mode (which performs a disk repair automatically). Then I rebooted regularly (from the HD) and went into Disk Utility and did another "Verify Disk". This time it verified successfully. I also repaired permissions successfully.
However...
when I booted from DVD, the drive was again invisible.

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Disk utility not recognizing HD

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