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The external power supplies are known to fail. Replacements are available. The budging of the case sure points to its failure.
That seems likely to me too. Any idea where to get replacement power supplies? Are there generic replacements out there?

Sources: 800D, Sooloos Control:15, Sony BDP-S790,Humax Freesat+
Control: 861v4, HD621
Front: DSP3100
Centre: DSP3100HC
Rear: DSP3100
Screen: Samsung UE50H6400
Projector: MF-10