Ok – was just shutting down my PC and noticed that I still had your pictures open. I had another look at the pic of the back of your desk
and noticed two things that I missed earlier (was watching the Simpsons at the time!).
1. When compared to the other pins, the lower left pin has been squashed – note the gap on the others. This could be a problem. There is also some discolouration adjacent to this pin but that could also be camera flash.
2. I noticed also that the power switch
shows signs of arcing (or heat damage), with an obvious burn mark
on the bottom.
I have a sneaking suspicion that there is some damage to the power
of this desk
and that your best bet would be to have someone service it for you.
It is possible that the power connector
has been wiggled a bit
too much when connecting/disconnecting the power
supply and this has squashed the pin and resulted in a high resistance connection. This could then result in heat damage that could be seen in the switch
. Although, I wouldn’t like to state exactly what has happened to the switch
. It is difficult to see if that is an arc or overheating. Then again, it could be a switch
fault or something else in the vicinity of the switch
and the squashed pin could be pure coincidence and not affecting the power
at all. However, if it were mine I would certainly spread that pin to ensure that it makes good contact.
You could do that first and then see if the board works. I would do so with the switch
off and just see if anything trips the RCD
that you are sure to be testing it on. If nothing untoward happens, I would switch
off at the wall and then switch
on before switching the unit
on at the wall.
In saying this however, I still recommend that you get someone qualified to take a look at it for you, as that switch
will certainly need replacing.