Hello, My Dvd player toshiba SD 680 SR doesn't read some DVDs (wrong zone), could you please help me to resolve this problem?

According to the Wikipedia, "DVD region codes are a DRM technique designed to allow motion picture studios to control aspects of a release, including content, release date, and price, according to the region. DVD video discs may be encoded with a region code restricting the area of the world in which they can be played.

The DVD Copy Control Association in California, USA, requires that DVD player manufacturers incorporate the Regional Playback Control (RPC) system - according to the Australian government's anti-monopoly watchdog, the ACCC. It is therefore this US Association that is responsible for the RPC system that effectively divides the world into six regions for the purposes of controlling and manipulating distribution within the global DVD market.

There are six different official regions and two informal variations. DVD discs may use one code, a combination of codes (Multi-Region), most codes (Region 0) or every code/no codes (Region All). The commercial DVD player specification requires that a player to be sold in a given place not play discs encoded for a different region; however, region-free DVD players are also commercially available.In addition, many DVD players can be modified to be region-free, allowing playback of all discs."

http://en.wikipedia.org/wiki/DVD_region_code

So, the disk you inserted in your DVD player must be from a different zone from the one it was select to play originally.

Unfortunatelly, I searched for a firmware to be installed in your DVD player to make it region free, but I did not manage to find one for this specific player. Sorry...

Hope this information helps you understand why your DVD player is behaving like that.

Try www.dvdexploder.com
Hope that helps.