coolwhip wrote:My HTPC and xBox360 are connected via HDMI to a Pioneer/Elite Home Theater Receiver. The receiver is connected via HDMI to a 50" Panasonic Plasma HDTV.
You need to read up on EDID. Most amps have several IN's (sources) and only one OUT (destination). If I am reading you right, you have 2 sources IN, (HTPC + XBOX) and one destination OUT (Plasma tv). The amp can switch between the two sources fine enough, but it appears that the amp is unable to remember the EDID's of the two sources. So, you likely can get either source to work but as soon as you switch the amp to the other source, the new source doesn't work.
The EDID problem has been around for years, normally it shows up having one source and two destinations. Many of the guys here have installed a dedicated HDMI splitter with one source and two destinations (usually for a monitor/projector combination). Basically all it does is remember the handshakes involved to make a proper connection.
Your problem is somewhat unique as you want to run two sources and one destination. That calls for a special splitter. Maybe someone else can suggest a different way.... but the way I corrected that problem on mine was to use a 4X4 HDMI Matrix Switcher. This allows any source to any destination. After some experimentation, I ended up making the amp one of the destinations. Mine has been on for 3-4 years now, and was not very expensive ($150).
You would connect the matrix switcher like this....
HTPC and XBOX as sources
PIONEER AND PANASONIC as destinations
Switchers don't make good amps, and nine times out of ten, amps don't make good switchers.
Something like this should work for you. Do a little research and make your decision.http://www.lightinthebox.com/4x2-4-2-hd ... 65306.html