I have used Macs since they came into existence. They don't tend to crash like other systems, but every computer is dependent on having a functional hard drive, and an operating system to run. As well, they need to have a power supply, that takes the electricity from the plug and delivers it to the CPU (Central Processing Unit). So those are three major things that can go wrong.

If you ever have any Mac questions, you can PM me, and if I don't know, I'd bet Paul does.