It is most likely what they call a "handshake" issue ... try turning the power on the processor on first and then turn the power on the OPPO on second after the processor is already turned on
With the processor turned on first when you turn the OPPO on ... the OPPO sends a handshake signal to the processor ... if the processor is on it will receive and return the handshake signal to the OPPO saying yes I'm here go ahead it's OK to send the signal now
If you turn the OPPO on first it immediately sends the handshake signal to the processor which because it is off won't receive the handshake signal from the OPPO ... then when you turn the processor on it is looking for the handshake signal from the OPPO which has already been sent so the processor doesn't receive the handshake and doesn't see the signal from the OPPO and is basically why you're not getting signal to the processor even though the OPPO is sending a signal
Older HDMI processor's had this issue in not being able to recognize the DVD's HDMI signal because the processor missed the handshake sent from the DVD player because the processor was off when the handshake was sent
This early handshake protocol was used because the early HDMI set ups featured HDCP copy write protection
Try turning the processor on first and then turn on the OPPO
If that doesn't work then try turning the OPPO on first and then the processor
It's been a long time since this was a problem and I may have the order of turn on backwards .. so if it doesn't work one way try it the other way I've suggested
Here's a link to the handshake issue and HDCP trouble shooting guide
I don't think there is a problem with your HDMI cable or processor .. I think it's a copy write handshake issue
More info at this link ... sorry I didn't read the link
http://www.hdcabling.co.za/hdcp_hdmi_handshake_troubleshooting_guidelines.php