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?
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.