When troubleshooting an Apple Studio Display for a failure specific to the display and not the computer.
First, with the system powered down, disconnect the ADB cable on the CPU, disconnect the AC power to the display, reconnect the AC power to the display, and reconnect the ADB cable on the CPU.
Next, verify the keyboard's ADB cable is connected to the ADB port on the Apple Studio Display's stand.
Finally, startup the computer to confirm if the problem remains.
A few examples of symptoms which may be resolved by performing the steps above are as follows:
- No video
- All white raster
- Random/predominant color throughout the display
- Function keys on the bottom of the display don't respond
If the problems remain, after performing the steps above, contact an Apple Authorized Service Provider in your area or contact Apple at 800-919-2775 for service.