Loose cables and electronics are bad. In electronics as sophisticated as computers, they can cause really odd behavior!

My wife’s Mac Mini was exhibiting odd behavior, namely, sporadic loss of sound. The internal speaker would suddenly become unavailable to the operating system. Furthermore, the speakers did have a slight hum when they were plugged into the Mac Mini. I had opened the Mac Mini up a couple times to upgrade the RAM, so I figured I must have inadvertently pulled the audio line. A few months later, the Mac Mini just outright refused to start up. I’d push the power button, I could hear it power on, but there was no startup chime and no boot-up. I figured the Mac had finally died, but I naturally wasn’t going to give up on it without an autopsy.

If you’ve ever looked at a tutorial on opening the Mac Mini, you know it isn’t the worst thing ever, but it definitely is more complicated than opening, say, a Mac Pro, or really any tower computer. One of the challenges is separating the top chassis, since it is connected with a few cables. One of these is a ribbon in the back, and this ribbon is what was giving me trouble. Take a look at the photo below.

As you can see, the connector was actually in the open position, so the ribbon was sitting loosely in the connector, sporadically losing its connection and wreaking havoc on the system. The ribbon must have eventually pulled away enough so that the computer couldn’t start up at all.

Here’s the ribbon properly inserted and the connector closed shut:

The Mac started fine after that, and it hasn’t had any startup or sound problems since.