Hi, have you checked that the leads are all pushed in properly. The plug can't have fused if the light is still on, on the plug. Doesn't sound like the power is getting through to the unit.
When switching off, leave it for a full five minutes before switching it back on. I have had to do this on more than one make of set-top box when they occasionally lock up. It lets residual voltages inside the unit die away completely before re-booting.