[G4] DVD Problem

[George]

For the first time since installing Tiger I tried to burn a DVD.  I  
got a message upon inserting the DVD disk that read, "The disc could  
not be used because the disc drive is not supported.  (Error code  
0x80020025).  The following is what comes up on System Profiler:

Hardware Overview:

   Machine Name:    Power Mac G4
   Machine Model:    PowerMac3,6
   CPU Type:    PowerPC G4  (3.3)
   Number Of CPUs:    2
   CPU Speed:    1.25 GHz
   L2 Cache (per CPU):    256 KB
   L3 Cache (per CPU):    1 MB
   Memory:    1.25 GB
   Bus Speed:    167 MHz
   Boot ROM Version:    4.6.0f1
   Serial Number:    XB3100GVN1X


PIONEER DVD-RW DVR-107D:

Firmware Revision:    1.09
Interconnect:                ATAPI
Burn Support:              Yes (Apple Shipped/Supported)
Cache:                          2000 KB
Reads DVD:                Yes
CD-Write:                     -R, -RW
DVD-Write:                  -R, -RW, +R, +RW
Burn Underrun Protection CD:        Yes
Burn Underrun Protection DVD:     Yes
Write Strategies:                                CD-TAO, CD-SAO, CD- 
Raw, DVD-DAO
Media:
     Media Type:        DVD-RW
     Blank:                   Yes
     Erasable:             Yes
     Overwriteable:    Yes
     Appendable:       Yes

Searches on Apple and Pioneer were unsuccessful.

Has anybody got any ideas?