Overall, Onkyo TX-NR509 5.1 Channel Network A/V Receiver is a good receiver and you will come to be very happy with it. The receiver does not covert between video formats. Onkyo TX-NR509 may be a standard thing with receivers, but it was unbeknownst to you when you bought it and then read about it with dismay in the manual. What this means is if you have, say, an HDMI cable in the video out source on your cable/satellite/DVD running into the receiver, and then a composite video cable going out from the receiver to your TV, you won't get any video because it won't convert between the HDMI and composite connection.
The above is very important because the receiver is on-screen display menus will ONLY work over an HDMI connection, meaning you must be running an HDMI cable out from the receiver to your TV as well as out from your video source devices. The receiver is on screen menus are great and it makes it easy to configure the set up items as well as listen to Internet music sources or an iPod.