All laptops will have video out, either DSUB, DVI, DisplayPort or HDMI. No laptop will rely on usb (for marketing purposes such as projectors) as a means for video, you could use an external USB Graphics card but performance would be crap. And what do you mean by all in one desktop system? Is it a laptop or desktop?
RCA is analog so if you had DVI-A or I or DSUB, it is possible with an adapter.