TiBook and Beamer

Hi, Sorry if this is a stupid question - I am really not a hardware guy :-) Yesterday I realised, that my TiBook cannot export the screen to a beamer through the monitor output. I am using SuSE 7.3 with kernel 2.4.16 - because with the original kernel I had no X. On my old Toshiba-Laptop I never encountered any problems with the connection of a beamer to the monitor output, so I didn't care for this until now: I will need the new Laptop soon for presentation - so any help would be very welcomed by Bernd