I have a Toshiba Satellite 1800-814 with Trident Cyberblade 16mb graphics which is what my instructions above were based on.
If it hasn't been of any use, try going into BIOS (press ESC at startup, I think) - I have 'screen stretch' options in there, too.
If it hasn't been of any use, try going into BIOS (press ESC at startup, I think) - I have 'screen stretch' options in there, too.