: Plug a device into every USB, HDMI, and charging port to confirm they aren't loose or broken from frequent use.
: Run a quick video or several browser tabs to see if the fan becomes excessively loud or if the laptop gets uncomfortably hot. Negotiation & Protection Buying A Demo Unit At A Retail Store - Experts Exchange buying a demo laptop
: Check for "burn-in" (ghostly images stuck on the screen) or dead pixels, especially on OLED models. : Plug a device into every USB, HDMI,
: Fans in display units can become choked with dust. buying a demo laptop