Hard Drive (Internal) no longer accessible, icon no longer on desktop!

I was in the process of switching startup disks, which I have done on occasion previously without incident, then the drive was stuck on the startup screen, I pressed the restart button on the front of the computer and have not been able to access the drive since. The icon for that drive no longer appears on my desktop. I have attempted Mucho different things to retrieve the drive to no avail :
1. disk util from internal drive
2. disk util from Tiger DVD install disk
3. TERMINAL Application
4. PMU reset
5. NvRAM reset
6. Removing DRAM then replacing the same memory cards
7. Moving the hard drives around to different bays within the tower
Disk Utility reads (-9972) error when attempting to repair. TERMINAL App. responds with INVALID NODE STRUCTURE VOLUME CHECK FAILED. System profiler does recognize the drive though I currently have no access to the drive.
Drive has many very important files which I had not yet back-upped! I feel like I'm the next person in the group circle to state my name and admit I have a problem not taking disk back-up seriously.
Any assistance would be greatly appreciated before, if necessary, shelling out mucho dinero$ for disk repair and file retrieval.
Power Mac G4 Dual 500   Mac OS X (10.4.5)   2 addtnl Maxtor 120gb hard drives, ATI AGP 128mb Vid Card, DVD+-RW 8x,PCI USB2

J Gordon
Thank you for replying
I have the jumpers set as follows: original hard drive as master-jumper vertically to far left; hard drive that is not accessible (Macintosh HD1) jumper positioned horizontally-top row-offset one row past left as diagramed on the hard drive exterior; 3rd hd connected to pci card with ata connection-jumper vertically to far left. After nothing else has resolved the issue Disk Warrior is something I have considered.
Again thank you for replying,
dd
Power Mac G4 Dual 500   Mac OS X (10.4.5)   2 addtnl Maxtor 120gb hard drives, ATI AGP 128mb Vid Card, DVD+-RW 8x,PCI USB2

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