Emphasize that technical hardware failures or errors occur when a manufacturer distributes a user’s equipment containing a known or unknown flaw. These defects can cause the system to perform outside of expected parameters, resulting in unreliable or unavailable service. 

Discuss that some errors are terminal in that they result in the unrecoverable loss of the equipment. Some errors are intermittent in that they only periodically manifest themselves, resulting in faults that are not easily repeated.
Stress that applying Murphy’s Law, it is more of a matter of when and not if computing equipment will break down.