Is my new EOS 550D faulty?

[Desrio]

Hi all,
I have just taken possession of a new Canon EOS 550D (Rebel T2i) and am having trouble with the autofocus function. It works in live view but that's all and I would rather frame my pictures in the viewfinder. Has anyone else had this problem or am I doing something wrong? Also the rotate function when reviewing images seems not to work. Once again, is it the camera or am I just being dim. Any help on these topics would be gratefully received before I return the camera and potentially make a fool of myself.