A:Answer Hi Chi,
We do apologize for the inconvenience. Power reset the unit, simply unplug the unit and wait 1-2 minutes then plug the device back in and power on. If the power reset doesn't work, check this link below for more troubleshooting steps to resolve your issue.
https://www.sony.com/electronics/support/audio-components-receivers-amplifiers/str-dh590/articles/00205292
Hope this helps!
David