I woke up this morning and found that one of my computers was down. No ping. So I looked at the PDU (Power Distribution Unit) that supplies power to it. And it was dark.
I checked the 10 amp fuse in the plug, it was fine. I pressed the reset, no change. So I wrote "DUFF" on the label, and went upstairs to the store room. I'm not going to try to repair it, because I have a ton of replacements.
Upstairs, I have two 120-volt PDUs (left over from when my servers were in Washington), a set of four 240-volt PDUs that I used when I was hosted at Watford, and four PDUs just like the faulty one, except that they worked. I can't remember where I used those. These PDUs have a serial link, but I wrote a web-based interface to make my life easier.
I also have two APC PDUs that have a web interface, and a couple of Polish-made PDUs that can handle 24 outlets each. Oh, and I also have a bunch of home-made PDUs, based on eight-way serial relay switches.
So, not a big problem that one failed.