In part 2 of my PC power supply testing series, I walk through a few extra, practical suggestions that help you validate a PSU the right way—without guessing and without turning your build into a science experiment. The big idea is simple: a PSU can “turn on” and still be a problem, so I focus on checking the rails you actually care about (+12V, +5V, +3.3V, and +5Vsb) and watching for anything that looks unstable or out of spec before you trust it with expensive hardware. Then I demonstrate using the Thermaltake Dr. Power III PSU tester, including how I hook it up, what the readouts mean, and how I use its Auto Scan mode to speed up basic validation. I also spend time on special precautions around the newer PCIe 12+4-pin / 12V-2x6 style GPU power connectors—because that cable is absolutely not where you want to get careless. If you’re building or troubleshooting a PC and you want a fast, repeatable way to sanity-check a power supply, this video shows the workflow I use and the things I pay attention to before I call a PSU “good.”