Before purchasing or selling a Macbook or iMac your should test it for functionality. Here is a quick procedure that we like to use without any extra software. In this video we test:

Speakers
Mouse
Microphone
Camera
Track Pad (Partial usage test)
Keyboard (Partial usage test)
WiFi (Partial usage test)
Screen LCD
Physical Condition of outer case
Over all system experience 

We hope this video guide will give you a good idea on how to quickly test a Mac before sale or purchase.

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