I was just poking about with my new thermal imagers and I found one of my power bricks was warm, while the one next to it, on the right, was not. Turned out the one on the right wasn’t plugged in properly! It was supposed to be powering a USB hub, but the hub was bus powered, not mains powered, and I couldn’t tell. I mean, all of the lights were on, and the power brick was plugged in, so I hadn’t suspected anything. If I hadn’t made this discovery with my thermal camera I would probably never have learned that my USB hub was unpowered. I could very well have run into problems with devices plugged into it being under powered, and I would never have known why.