I have a toshiba sd-4990su dvd player. The dvd frooze during play and now it wont play, nor will the tray open either by either the buttons on the unit or via the remote. I've unplugged the unit and restarted but tht didnt do anything

SOURCE: DVD tray WONT OPEN

unplug it and try it again, if that doesn't work see if theres a pin hole where you can push a paper clip in by the tray area.

SOURCE: Toshiba SD-3980

http://www.tacp.toshiba.com/tacpassets-images/notices/sd-3980_sd-k750.asp

read that

SOURCE: Toshiba dvd player tray is stuck.

can u give me more details please?

SOURCE: Toshiba DVD SD-3980SU2 or SC2 player loads every disc as "bad disc"

Toshiba says:
Information for Owners of Toshiba SD-3980 and SD-K750 DVD Players To ensure the satisfaction of our customers and to maintain the integrity and quality of our products, Toshiba America Consumer Products, L.L.C. is issuing an important product update. This is not a safety issue.
Toshiba is committed to customer service and to continuously improving the quality of its products. It has come to our attention that certain DVD players bearing the model numbers SD-3980 and SD-K750 may at some point in their life stop playing discs due to a component part failure. In such case, the error message "bad" will be shown on the unit's display. Affected units will have "SU2" at the end of the model name (e.g., SD-3980-SU2), which can be found on the back of the unit.
If you own either of these models and experience the issue described above, please contact Toshiba Customer Solutions at 1-800-631-3811 for information on how to obtain a replacement unit.

SOURCE: toshiba sd-4205 5-dvd carousel changer

This may not work for everyone, but.....
I had the same problem with the Toshiba SD-3205. After unplugging, trying button combos, etc, nothing worked. I could here a slight whine inside the machine, and then again...."MECHA ERROR".
I turned the unit on its side to see if there was a manual tray button on the bottom. Nothing. Then just to try it, I turned the machine off and on again while on its side.
It started up, I heard a clatter, and then the display changed to "INSERT DISC". I placed it the right way up again and pressed "OPEN TRAY" and it worked!
My theroy: There was one DVD in the carousel, and I think last time the tray shut, it got wedged somehow and prevented the carousel from rotating. Turning the machine on its side and pressing "OPEN" is what dislodged the disk.