Unfortunately, there tend to be more HDMI handshake problem reports with Onkyos than with other receivers.
Why are you sending 720p to a set that only outputs 480p? You might have more success if you set each of your devices to 480p so that there's no down conversion required by the Samsung or the Onkyo.
Also, what happens if you connect your devices directly to the TV? If the same thing happens, you know the Onkyo is not to blame. But, if the TV is able to negotiate a connection properly each time, even when the devices are set to 720p, then it's likely there's a problem with the Onkyo.
Last edited by BIslander; 01-02-2010 at 03:01 PM..