Looking over the manul I get the impression it is real picky on what it will play.
It does not like + dvd’s Start pg 11 to 13
If the gear was out of whack maybe the laser is also, or it just needs cleaning, or use.
From Toshiba site :
CD-R/CD-RW discs recorded by CD-DA method can be played back. Some CD-R/CD-RW discs may be incompatible due to laser pick-up and disc design. DVD-R discs recorded by DVD Video method can be played. Some DVD-R discs may be incompatible due to laser pick-up and disc design. WMA, MP3 and JPEG discs may be incompatible due to different recording format or condition of disc.
3 Certain encrypted programming may not be recordable.