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If the display and everything else appears to work it could be the amplifier, it has probably overheated, there may be an internal fuse, possibly an inline fuse, otherwise it probably means a new amp.
Could possibly be a dry joiny/fault volume control that has failed.
Either way it sounds like a fault within the unit itself and a car stereo repair specialist is required. Unless you ( or you know someone) are any good with electronics it will be difficult to carry out a diy repair on the unit, unless it is something quite simple.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.