DVD burner not recognizing DVDs

I've had a mini for quite some time now, and recently in the past few weeks I've had a strange problem where it no longer recognizes burnable/burned DVDs. CDs work fine, retail DVDs on movies work fine, but I am unable to access any of the things I've burned myself.
I've tried 3 of the types of burnable DVDs, and have even dug up some of my old DVDs I burned myself on this computer and they all do not mount. I've checked the system info, and the drive is still being detected as a DVD burner, so I am at a complete loss as to what could be causing this.
Any help would be greatly appreciated

I'm having exactly the same problem as this.
The last discs that I burned would have been in October/November, and after that I noticed that the Mac would no longer recognise burned DVD's.
As I need to burn some more discs I've been testing in the past few days and can confirm:
1. Will not read from burned DVD-R
2. Will not recognize blank DVD-R
3. Will recognize blank DVD-RW, but will not burn to them
I'm now searching around to see if it's a hardware or a firmware problem.
The data on the drive from System Profiler is as follows:
MATSHITA DVD-R UJ-835F:
Firmware Revision: GGND
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: No
Any ideas anyone?
Thanks in advance.
Mac Mini G4 1.42ghz Mac OS X (10.4.8)

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****Click the White thumb to say thanks****
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Message was edited by: Fortuny

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DVD burner not recognizing DVDs

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