Practice Test GeeksACMT - Apple Certified Macintosh Technician Practice Test
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Display & Video Troubleshooting Flashcards

6 cards from real ACMT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Display & Video Troubleshooting flashcards as text

  1. A customer's Mac is connected to a 4K display but it only shows at 1080p. What should the technician verify?

    Answer: Whether the cable supports 4K resolution and whether the correct resolution is selected in Displays preferences

    4K output requires a cable that supports the bandwidth (such as HDMI 2.0 or DisplayPort 1.2+) and the correct resolution must be selected in System Settings > Displays.

  2. Which technology allows Apple Silicon MacBook Pro models to connect to up to four external displays?

    Answer: Thunderbolt 4 with DisplayPort Alt Mode and a Thunderbolt dock

    Apple Silicon MacBook Pros support multiple external displays via Thunderbolt 4 ports using compatible docks or daisy-chaining Thunderbolt displays.

  3. A MacBook Pro with dedicated GPU shows distorted graphics only when the dGPU is active. What does this indicate?

    Answer: The discrete GPU (dGPU) on the logic board is failing

    Graphical distortion that appears only when the discrete GPU is active and clears when using the integrated GPU isolates the fault to the dGPU on the logic board.

  4. How can a technician force a MacBook Pro with dual GPUs to use only the integrated GPU for diagnostic purposes?

    Answer: Navigate to System Settings > Battery and disable 'Automatic graphics switching', or use gfxCardStatus

    Disabling automatic graphics switching forces the Mac to use the integrated GPU, helping isolate whether display issues are caused by the discrete GPU.

  5. A Mac mini's display output shows no signal on an HDMI monitor. The monitor works with another device. What should the technician try first?

    Answer: Try a different HDMI cable and verify the Mac mini is powered on and awake

    Faulty or incompatible HDMI cables are a common cause of 'no signal' issues, and swapping the cable is a quick, non-invasive first step.

  6. Which display technology used in modern MacBook Pros provides extreme contrast ratios by locally dimming sections of the display?

    Answer: Liquid Retina XDR display using mini-LED backlighting with local dimming zones

    The Liquid Retina XDR display in MacBook Pro models uses mini-LED backlighting with thousands of local dimming zones to achieve high contrast and peak brightness.