The status indicator light (SIL) on Mac mini, Mac Studio, and Mac Pro has different patterns based on the state of your Mac. These patterns also occur on some earlier MacBook, MacBook Pro, MacBook Air, and iMac models, though not all Macs have a SIL. If you have a Mac Pro, learn about the status indicator light behavior on Mac Pro (2019).
When your Mac is turned off, the status indicator light does not illuminate.
Turned on or in sleep mode
After your Mac turns on or goes to sleep, the status indicator light is solid white and remains on until the computer turns off.
On Mac mini models introduced in 2010 and earlier, the status indicator light turns off after the display turns on. On Mac models introduced in 2014 and earlier, the status indicator light pulsates on and off slowly when the computer is in sleep.
Firmware recovery mode
If your Mac is in firmware recovery mode, the status indicator light rapidly flashes amber or is solid amber and your display may show a blank screen. You might need to revive the firmware on your Mac with Apple silicon or revive the firmware on your Intel-based Mac. If you still need help, contact an Apple Authorized Service Provider.
If the SIL flashes
If the SIL flashes white one or more times after you turn on the computer, there may be a hardware issue. To isolate the issue, run Apple Diagnostics.