If you don't have an HDMI TV or display that you can connect to your receiver then you have a couple of options. If your receiver is connected to your home network then you can download the Receiver Manager software linked in the RX-A1010 thread on these forums and use that to change the settings of your receiver. Failing that you'll need to reset your receiver to factory defaults. The instructions are near the back of the manual in the Advanced Setup section. After you reset to factory defaults you'll need to completely redo any configuration changes you made before, including running YPAO again.