DVDs wont appear or mount on desktop, but can be ejected from menu bar

Hi: I have a 15" G4 Powerbook That suddenly no longer recognizes dvds whther they are movies I want to watch or data dvds. They don't appear on the desktop or in any list of volumes, but they DO APEAR in the little "eject" menu from the menu bar and in that menu they are correctly named. Furthermore, CDs operate perfectly. If I put a movie dvd in, the player says it isn't a compatible format. This is very sudden and everything worked fine before.
Does anybody have anyn idea what I can do to fix this problem? is it softeware or hardware? My configuration is below. Thank you.
Machine Name: PowerBook G4 15"
Machine Model: PowerBook5,6
CPU Type: PowerPC G4 (1.2)
Number Of CPUs: 1
CPU Speed: 1.67 GHz
L2 Cache (per CPU): 512 KB
Memory: 1.5 GB
Bus Speed: 167 MHz
Boot ROM Version: 4.9.1f1
Serial Number: W851852CRG4
Sudden Motion Sensor:
State: Enabled
Version: 1.0
MATSHITA DVD-R UJ-845E:
Firmware Revision: DMP2
Interconnect: ATAPI
Burn Support: Yes (Apple Shipped/Supported)
Cache: 2048 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, DVD-DAO
Media:
Media Type: CD-ROM
Blank: No
Erasable: No
Overwritable: No
Appendable: No

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