Samsung S23750D Bad Picture Quality

[Reykor]

Hey guys, I just bought the Samsung S23750D monitor. I hooked it up to my hd cable box via HDMI and got really disappointed. The image looked really grainy and the colors really washed out.
Anyone knows why?
Rui

 

[revolution2718]

Are you watching an HD channel?

 

[Reykor]

Yes, fox HD actually.

 

[Reykor]

Can anyone help?