Could be either. Have you no paperwork to say what work they have done?
How old is the laptop? When did you buy it and from where?
Also what was the fault that caused you to send it to the Tech Guys?
and of course, what make and model is it?
OnePlus 5 review
See the work of famous artists playing with toys
iPad Pro 10.5in (2017) review
Comment faire une capture d’écran sur un Mac ?