When I start any activity that uses my Dell TV (4201C) and Pioneer amp (VSX1123k), the TV shows 'no input found' unless I power off the amp and turn it back on. It goes like this:

Watch TV: powers on my Dell 4201c TV, next my Comcast X1 (which in reality is always on) and my Pioneer VSX1123k. Both the amp and TV are on the correct inputs, but TV says 'no input found'. If I turn the amp off with it's remote and right back on, the TV now displays properly.

I've spent about two hours messing with delays and such, but no luck. Any help is appreciated.