This sounds so simple. I want to run my components (DVD, Roku) through my receiver to my TV. It has worked in the past so I don't know what is wrong. My TV says I'm not getting a signal. From my receiver, I run HDMI out to HDMI in on the TV (I have four HDMI inputs on my Sony TV. I then connect my DVD player to the back of the receiver (HDMI 1). I try to do the onscreen setup and still says "no signal, check the external input. I have set the receiver HDMI 1 for DVD. I don't understand why this is not working. Should note that it has in the past taken time before it would show up on the TV. All of a sudden the DVD or Roku player just starts working on the TV. I don't understand and would appreciated help.
TV is a Sony with four HDMI inputs
Receiver is a Onkyo with four HDMI inputs
If you have done this and still have the same issue, then have you tried connecting your Blu-ray Disc player directly to the TV using the existing HDMI cable currently connected to the A/V receiver? This is not a 'permanent' solution, just a check to ensure that the cable appears to be working properly.
What length are the HDMI cables? Where were they purchased from?
I'm sure you'll get some other ideas here, but I would start by looking at the cabling that is in place.