This particular PowerPoint presenter device (Logitech R400) has been helping me teach for the past five years. When it went kaput, I wanted to find someone to help me fix it since I had no idea about IT stuff.
Remember that failure is an event, not a person
But the internet provided the solution. People around the world share how they fix things and post it on forums and discussion pages online. I found such a site and followed instructions using a kitchen knife, opened the device and fixed the tiny switch. Now the device is working again.