I just bought a vizio model E3D320VX. I would like to plug my xbox 360 elite 120G into it through and HDMI cable but when I do I get a purple screen half of the time, the other half it says no signal. At first I though the tv's HDMI port was messed up so I plugged a PS3 into it and it worked fine. Then I though it might be my Xbox but my friends Xbox does the same thing. I suppose there is a chance both of are Xboxs are broken but that doesn't seem likely. Any thoughts?