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Have erased disk on iMac
trying to reinstall operating system (Catalina)from the web
long story/short I have stuffed up
now can only get black screen with flashing file icon with a question mark
please help this dumb Aussie
iMac 21.5″, macOS 10.15
With computer Off, turn On and Immediately hold the three key combination Command + Options + R. It may be better if using a USB keyboard and mouse but can be done with Bluetooth devices. It will seek a Wifi connection or if connected to Hard Wired connection is best and faster. The Apple Globe will appear after some time ( this is called Internet Recovery Mode ). Once that is loaded, in Menu Bar choose Utilities and Disk Utilities. Choose internal drive and choose to Erase it. Make sure to choose APFS Format and GUID ( Journaled ) Partition Scheme. Once that is done, back out of Disk Utilities. It will present Install a New MacOS. It will start downloading the Full Installation ( about 8.5 GB ). Once it is finished it will automatically start the installation process.
Good Luck
With computer Off, turn On and Immediately hold the three key combination Command + Options + R. It may be better if using a USB keyboard and mouse but can be done with Bluetooth devices. It will seek a Wifi connection or if connected to Hard Wired connection is best and faster. The Apple Globe will appear after some time ( this is called Internet Recovery Mode ). Once that is loaded, in Menu Bar choose Utilities and Disk Utilities. Choose internal drive and choose to Erase it. Make sure to choose APFS Format and GUID ( Journaled ) Partition Scheme. Once that is done, back out of Disk Utilities. It will present Install a New MacOS. It will start downloading the Full Installation ( about 8.5 GB ). Once it is finished it will automatically start the installation process.
Good Luck
Thanks P
it’s 8:10 p.m. in Brisbane and I will leave it until the morning to use your solution and will let you know how I go
thanks again Jim
Welcome and yes do keep us posted on progress.
Pierre ( from Toronto )
Thanks Pierre
You’re a champion
worked a charm
cheers. Jim
Thank you for getting back with progress. Good the hear the issue is solved. Enjoy.
internet install
