ACMT Display & Video Troubleshooting 3

Question 1

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

Accepted Answer

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

Answer

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.

Question 2

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

Accepted Answer

Thunderbolt 4 with DisplayPort Alt Mode and a Thunderbolt dock

Answer

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

Question 3

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

Accepted Answer

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

Answer

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.

Question 4

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

Accepted Answer

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

Answer

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

Question 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?

Accepted Answer

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

Answer

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

ACMT - Apple Certified Macintosh Technician Practice Test

ACMT - Apple Certified Macintosh Technician Practice Test

ACMT Display & Video Troubleshooting 3