Hooking up Xbox with sony trinitron TV?

Hey, I have just bought an old SONY TRINITRON COLOUR TV KV-X2521U and am currently trying to connect it with my xbox. However although the cable fits in the back when I tune the TV to channel 0 (the usual channel that the xbox plays on) I get nothing.
I've tried pressing all the buttons but nothing is happening, are they not compatible or is there a certain combination of buttons or what??

any help/ suggestions would be greatly appreciated.