it could be set to the wrong NTSC/PAL standard. It could also be set to the wrong SVIDEO/Composite output. You might find those in the advanced display settings.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>