According to USA Today, a massive solar storm happen around 2,700 years ago and could happen again. The difference is that, at that time, it had little or no effect on the human race. But, if it happened today, it should wipe out the internet and more.

Though it had little to no impact on people in that long ago, pre-industrial and pre-technological world, such an event today would cause widespread power outages along with potentially disastrous communication and navigation failures.

 

A solar storm of that strength would be "a threat to modern society in terms of communication and navigation systems, space technologies and commercial aircraft operations...