It has to be the GPU/driver issue because it was fine using just the CPU. If I restart the PC it is also fine.
Onkyo TX NR515
Gigabyte F2A88xm hd3
AMD A8 7600
AMD R9 270
HP ir USB receiver
Logitech Harmony 650 universal remote control.
I have tried the following:
Update the drivers / amd catalyst software
Roll back drivers / software
Delay PC power on
Delay TV and onkyo power on (HDMI cec)
Changed input from PC to cbl/Sat (to test if receiver was issue)
Enabled pass through on receiver.
I've searched and tried lots of different things but still no joy.
Does anyone know what the problem could be, or suggest some more things to try?