I have a Alba TV DVD Combo lcd32advd. I can't get any colour, only black and Alba TV DVD Combo.

SOURCE: alba-combined tv and dvd player - dvd section not working

open the tv and a dvd section
its either a motor is not running
or laser is not lighting
or dirty

SOURCE: VHS plays in colour and DVD plays in black and white.

there is a circuit in the color section to put the tv to black and white if the color subcarrier is missing from the broadcast signal.
it is called a color killer and needs to be adjusted.
it is for a technician to do.
it operates off the 3.58mhz color subcarrier.

SOURCE: Picture only shows in black & white when playing DVD

Same problem with an older JVC player. One end of the S-video cable was loose. Pushed in in tight and everything ok again. Cheap fix if it works for you.

SOURCE: alba LCD32ADVD manual

I pressed P - on remote control, I cannot get a picture of any kind

SOURCE: alba dvd/tv combo playing dvd's in black and white

There are a couple of things you could try with this. One, is to make sure that the video input is connected properly. The second would be to make sure that the DVD that played in black and white automatically changed your settings to PAL rather than NTSC