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 input
stage 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 the
power off at the wall and then
switch the
desk 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.