: Open a full-screen white background to check for dead pixels, lines, or spots. For newer models, verify if True Tone is available in Settings; if it's missing, the screen has likely been replaced with an inferior third-party part.
Before handing over any money, perform these physical and functional checks: tips for buying a used macbook
: Go to Apple Menu > System Settings > General > About > System Report > Power . Under 300 cycles : Excellent condition. : Open a full-screen white background to check
: Expect reduced runtime; 1,000 is typically the limit where Apple recommends replacement. or spots. For newer models