Super drive does not recognize video DVDs-what wrong?

My iMac G5 running OS X 10.4.8 will not play commercial videos.
When I put any video in the drive, I get the following message:
"Disk Insertion
The disk you inserted is not readable by this computer"
and I am given the choice of ingnoring it or ejecting it.
Here is what the system profiler says about a video in the drive;
PIONEER DVD-RW DVR-K04F:
Firmware Revision: I437
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-ROM
Blank: No
Erasable: No
Overwritable: No
Appendable: No
I used to be able to play Video DVDs. The hardware suddenly stopped recognizing them. I also have a bootable external disk with 10.4.7. The same problem occurs when running this system. Interestingly, Limewire will not run under the 10.4.8 system but tuns fine under the 10.4.7 system.
Does anyone have any idea what is wrong or what I can do to play Video DVDs again?

I am just adding to this post.
I have tried to repair permissions in Disk Utility with no result
I can play video DVDs with VLC and can rip them with Handbrake. No other program will recognize the DVDs

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