Take some pictures of the board so we can all have fun pointing to the obvious fuse
I'm not sure it would have a fuse at the output though, most power supplies don't have one.
They just measure the voltage at the output (crowbar) and the current, and fold back if anything is wrong.
And of course it's not a problem, it's a challenge
I figured it might be packaged like a resistor, but I couldn't see any so far that aren't actually resistors, I went to hook it back up in case it was a PTC that clamped down (although I did re-test it quite some time later) and the thing works again, I haven't checked the voltage output but it powers up
Maybe a power surge did that, I have also been having some issues with one of my bench supplies at random (voltage changing on it's own, I have a video actually let me upload it, I haven't opened that thing up yet, it is a really nice old analog one though. I want to add nixie color backlights to the displays)
But yeah the thing seems to be powering up fine now, so who knows.
Here are pictures of the board, not exactly great quality from my phone and I only have one light I was able to try and light the board up with properly. I'm still going to go over every resistor style thing in there that I can see to find a fuse.
Yes, I did make sure to reconnect that resistor and that to-220 package before powering it up, that wouldn't have caused it though as it died when it was all sealed up with a warranty sticker. (left it closed up while it sat for a while in case it was a PTC as well.)
Unfortunately I don't know where a couple of the big arse sand filled fuses from a big APC supply are, otherwise I would have tucked one in there as a joke lol. It is really odd that there isn't anything that is obviously a fuse, I beeped my way around the AC input lines and nothing for protection aside from that gas discharge tube and a diode.