FAULTY Swann CCTV NVR / DVR No power - Can I fix it?

A friend asked me if I would take a look at his Swann CCTV NVR (network video recorder).
During a storm he experienced a few brief power cuts before being left without mains electricity for a week. When his power was fully restored, the unit no longer switched on, and was completely dead.
Let's take it apart, see if we can diagnose the problem and hopefully repair it!
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Thanks!
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