Diagnosing and repairing a faulty power button on a desktop computer involves several steps: 1. **Check External Factors:** - Ensure that the power outlet is functioning by plugging in another device.

What you might not know is there's a simple fix for this: a USB-powered external power button you can place right on your desk, like the Azmxdvp external PC power button, which retails for $8.99 ...

There’s a SATA cable if you want to add a 2.5-inch hard drive or SSD inside this mini PC, along with an external power button, but more on that later. (Image credit: Tom's Guide) ...