Suddenly stopped turning on

I have been using the soldering iron today, set it down for 1h, came back... and now it won't light up when plugged in. The web interface does not find it. I don't get an USB device plugged in sound (should it even do that?).

Any ideas on how to narrow down the error?

It is about 2 years old. I used it maybe 20 times since then.
I tried multiple power supplies but nothing seems to help.

Does anyone have any more trouble shooting tipps?

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Make sure that the switch is in the ON position (even I forget sometimes). The only other thing I would think to do is hard reset it. Unplug everything from it, then hold the power and knob buttons for at least 10 seconds. Hope it works again!

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Hi, what do you mean by power and knob buttons? Is that something on the iFixIt power supply?

I just use any (sufficiently powerful) USB-C power supply.

Also if I remember correctly, at least some LED indicator should light up, even if not switched on.
And since it does also not show up in the web interface, I assume something is broken.

To avoid further confusion, I made a short video. (Yes it worked nicely before using a 65W thinkpad power brick)

https://wolke.fr-voelkl.de/s/CnPdq3bXLm9...

(edit since the video worked in preview but not after posting)

If nobody has an idea I guess I'll start by opening it up and check for any loose connections... and then order a replacement main-board....

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