Apple · Desktop
iMac Retina 5K 27-inch 2019
iMac19,1 · MRQYxx/A · MRR0xx/A · MRR1xx/A · iMac Retina 5K 27-inch 2019
OptionHold
Startup Manager / boot disk menuHold immediately after pressing the power button, then choose an available startup disk.
Command-RHold
macOS RecoveryHold immediately after pressing the power button to start from the built-in recovery system.
Option-Command-RHold
Internet RecoveryHold immediately after pressing the power button to start recovery over the internet.
DHold
Apple DiagnosticsHold immediately after pressing the power button. Use Option-D to start diagnostics over the internet.
Option-Command-P-RHold
Reset NVRAM / PRAMThis startup combination applies to Intel Macs, not Apple silicon Macs.
Manufacturer verified · checked
Apple identifies this model and its model identifiers on the linked support page. Intel Macs use startup key combinations instead of a PC-style BIOS setup key.