Seems to be that there is no factory data installed on your PSR (at least for the MDB). Hopefully not an Italian standard ;-)

Do you have access to the Flash styles or the preset registrations (reg bank 1-3)?

Anyway, to reload the factory setup go to the Yamaha PK Club site, download the Flashdata and proceed as described also on the web site (or look into the manual p. 130).

Link: http://www.yamaha.co.jp/english/product/pk/nonflash/products/psr9000/p9000me/p9000os.htm

Probably the data is already on one of the disks you have got together with the keyboard.

Ulrich