How the scam works:
This is the most commonly used scam when it comes to computers that need to be fixed at a shop (not via online). Most people are not computer literate and it often happens that their machine or laptop has a minor fault: a wrong setting, unplugged cable, cache not cleared, etc.
When the victim takes the computer to the “doctor”, the “fixer” will claim the problem is more complex, depending on how well he reads the victim’s naivety. In some cases, the scammers even suggest the PC is irreparably damaged and the victim needs a new one (which of course, can be purchased from them).
How to avoid:
Always ask for a second opinion when it comes to things you're not good at. Regardless, you should always have an antivirus software installed on your computer.
Make your friends and family aware of this scam by sharing it, using the buttons provided.