IMac G5 cant read and write DVD-R

Hi. I have iMac G5 1.9 with Superdrive MATSHITADVD-R UJ-846 with Firmware Revision: FA0G. Everything was OK, I was able to burn DVD-R and DVD+R too, but now Superdrive ejects all DVD-R disks. I cant burn it, I cant read it. DVD+R are working correctly.
System Profile is saying, that I can burn DVD-R and DVD+R:
D-Write: -R, -RW
DVD-Write: -R, -RW, +R, +RW, +R DL
but everythime I try it, the disk is ejected.
What is a problem? Can anybody help please.
Thank you.

To Apple Discussions!
Make sure you have enough storage space to burn.
Make sure the DVDs are not scratched, smudged and/or dirty.
http://docs.info.apple.com/article.html?artnum=50448 How to Handle and Clean CD and DVD Discs
If your drive needs cleaning, cleaning kits can be purchased from any store that sells CD/DVDs.
Also, check your Mac OS Help Menu for troubleshooting tips. In the search field type dvd.
You can also open up the "Utilites Folder">Disk Utility.
At the bottom left of the window, click on the black ? mark inside the purplecircle.
The help window will open up.
Enter dvd in the search field.

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Make sure you have enough storage space to burn.
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http://docs.info.apple.com/article.html?artnum=50448 How to Handle and Clean CD and DVD Discs
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I am in need of yr help.
In my application i am using UTF-16LE to export and import the data when i am doing immediate.
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Thanks in advance.

Hello,
thanks for yr reply...
I did the as per yr words using StreamWriter but the problem is i need a temp file name to create writer to write into that.
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