I'm guessing that the Motorola box has a DVI output (hence the PDV cable). It sounds like you're fine on everything. As butchgo points out, the trio of PSC's are optional with the existing sources you have. For just access to the 990's menu, any composite or s-video cable will suffice. If you did go ahead and hook up the component video output of the 990 to the HDTV, you'll have the option of adding any analog video source later (composite, s-video, or component) without making any other changes.