It may be worth trying different CD-R media with your existing CD recorder. I know someone who has a Liteon 40x12x48 and he thought there was something wrong with his recorder as most of the CDs he recorded refused to play back in some DVD-ROM drives and CD-ROMs read them very slowly. :eek: He never had this problem with with with the same media on his previous 4x CD-burner.
I told him to try Memorex CD-R media as this works good for me and when he tried one of these, the Memorex CD-R read back in every CD-ROM & DVD-ROM without speed issues or read problems. It may be worth checking the recommended CD-R brands in the manual if it metions. Ricoh brand tends to be universally compatible and most CD-Recorder brands recommend these, including my Samsung 8x burner. The Tevion CD-Rs that ALDI sell (bulk buy German supermarket) typically come up as Ricoh according to Nero's Infotool and I never had any problems with these. If you use Memorex CD-Rs, keep them in a safe place as they are not that scratch resistant.
Also, if you have not run a CD-lens cleaner in the last few months, it may be worth doing so. My Samsung CD burner started failing the odd CD-Rs not to long ago, but when I ran a Lens cleaning CD in it, it never failed a CD-R since. These are available in most Music shops and some supermarkets also.