Hi

My cousin uses HDMI to connect his PC to his 24inch Dell monitor. It looks great and really seems to emphasise colour. I want to do this but whenever i connect via HDMI the colour is completely messed up. It looks awful. My cousins screen has a setting for graphics under HDMI settings which makes his screen look great. My screen doesn't have that option.

How can I get it to look great?

What settings should I tweak??