Computers don’t usually give signs that have have been hacked. In the meantime, your computer is being used for all sorts of nefarious activities.
In most cases, a hacked computer and one that isn’t hacked, look exactly the same. Many people think that when a computer is hacked, they will immediately know. This just isn’t the case.
Many HIPAA breaches that involved hacked systems go undetected for months or years.