What to look out for when viewing used laptops?

Sh
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What to look out for when viewing used laptops?

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Are the display hinges okay or stiff?
Are there any breaks in the housing (mostly also in the hinge area)
Are there any screws missing on the underside (= Has anyone ever taken it apart = be careful!)
Are all keys on the keyboard fixed / can all keys be typed
Is the fan noticeably loud / always on?
The display has any pixel errors

Gu

Battery, whether buttons, touchpad work, all ports work… These are a few weak points.