hifi engine

SONY HCDED1 stuck in 'standby' mode.

This micro HiFi doesn't function at all-only the Standby indicator is on.
I have checked the PSU Board, and all seems OK here(I should explain that I worked as a radio service engineer for nearly 23 years until 1995, though I am not familiar with this model)My suspicions are drawn to possible fault(s) in the microprocessor (system control) Can anyone shed any light on this, please?