Sony convex speakers demonstrated    • SONY convex speaker (CFD-S300) - Free...  
These are great sounding players but they are plagued with bad electrolytic capacitors.

I also found the following comment on the same Sony CFD S350 player: "If you have no power when you press the power button then replace C822 , 220 µF 10V on the main board. If this capacitor is faulty, Vcc for the main CPU IC801 is not present so nothing works at all."