Help! Problem with PC-HDMI-TV connection

Previously, I'd been using a laptop -> hdmi cable -> denon receiver -> hdmi cable -> samsung led tv setup. For the most part, this ran well. However, from time to time I needed to fiddle with the display settings (extending them again) in order for the TV to pick up the PC signal.

When I first booted up my new desktop, however, the TV immediately recognized the connection, and I was able to get started installing Windows without a problem. I went off to get dinner, shut off my receiver and TV, and came back home expecting it all to work again.

Nope. Turned everything on and no signal was recognized. Eventually used a direct hdmi cable connection between the PC and TV in order to get a picture again. However, after restarting, I can't even get this to work now. I am essentially without any monitor, so am unable to mess with any device settings.

Any reason why this might happen? Seems weird to have fluctuations with my connections for seemingly no reason.
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  1. Any ideas from anyone? I hate to take this issue to the Geek Squad and waste another chunk of money.
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