When I tried to reinstall MacOs, I found NO disk can be selected. Thereafter go to Disk Utility, and found below - "UNFORMATTED" HDD. Any one got experiences and clear steps, which helps to enable the attempt to reinstall MaxOs. Thanks.
iMac Line (2012 and Later)
Hi,
Go back into Disk Utility > select top item on left (Apple someting or whatever it's called) > click on Erase > choose Mac OS Extended (Journaled) and GUID (if you're installing an OS prior to High Sierra) or APFS and GUID (if you're installing High Sierra or later) > follow prompts. This will format your HDD and should then allow you to go back to the installation process and select the drive.
Hi,
Go back into Disk Utility > select top item on left (Apple someting or whatever it's called) > click on Erase > choose Mac OS Extended (Journaled) and GUID (if you're installing an OS prior to High Sierra) or APFS and GUID (if you're installing High Sierra or later) > follow prompts. This will format your HDD and should then allow you to go back to the installation process and select the drive.
From your description it appears the User ( you ) had used this method from Apple ? Use Disk Utility to erase an Intel-based Mac
Is that correct ?
Then this method from Apple to Reinstall from Recovery Mode
Reinstall macOS
Reinstalling macOS does not remove data from your Mac. To begin installation, select Reinstall macOS from the utilities window in macOS Recovery, then click Continue and follow the onscreen instructions.
Follow these guidelines during installation:
Great and thanks! That helped me to have re-installed MacOS Sierra for now.
Next strange issue - Cannot find BLUETOOTH in menu bar, or even No BLUETOOTH icon in System Preferences. Got to keep connecting keyboard/trackpad by cables now.
Any experience and advise please.
That is - to select and erase the internal disk "APPLE HDD HTS...Media" first?
Correct
You're welcome. Don't know what to tell you about Bluetooth, it should be there.
Just update here. Final resolution is go to apple repair, full reinstall to Catalina, and Bluetooth hardware detection is back and sticky (by wired) keyboard, mouse all resolved.
Glad you got it all worked out.
Problem to reinstall MacOs in Recovery
