So far I am lucky enough to have not had any classes that have had the issue of a professor not being able to get their projector or computer to work.

Closest I had was the Linux VMs we were using for a Linux fundamentals class were having troubles because someone gave them too much resources by accident (I think it was memory but I don't fully remember), causing them to sometimes just stop working because there wasn't enough for every VM. Somehow persisted pretty much the whole quarter before being figured out.