Blank screen on iMac

Question

Blank screen on iMac

I could only get a blank screen on my 27” iMac despite trying usual solutions such as switch off, unplug etc., and now I have it in recovery mode it has been trying to restart with the usual start up noise for over 8 hours. Is this normal please? Thank you. Yvonne

iMac 27″, macOS 10.15

Posted on Aug 23, 2020 12:21 PM

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Answer 1

Top-ranking reply

Kappy

Level 10

361,849 points

Aug 23, 2020 1:50 PM in response to yvonnefromtaunton

Were you able to successfully boot into Recovery Mode? If so, then try the following:

Install El Capitan or Later from Scratch

Restart the computer. Immediately, at or before the chime, hold down the Command and R keys until the Apple logo and progress bar appear. Wait until the Utility Menu appears.
Select Disk Utility from the Utility Menu and click on the Continue button.
When Disk Utility loads select the target drive (out-dented entry w/type and size info) from the Device list.
Click on the Erase button in Disk Utility's toolbar. A panel will drop down.
Set the partition scheme to GUID.
Set the Format type to Mac OS Extended (Journaled.)
Click on the Apply button, then wait for the Done button to activate and click on it.
Quit Disk Utility and return to the Utility Menu.
Select Install OS X and click on the Continue button.

If you are unable to get through the above, then most likely it was because of a problem with the drive.

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Answer 2

Kappy

Level 10

361,849 points

Aug 23, 2020 12:39 PM in response to yvonnefromtaunton

Does the screen work in Recovery Mode? If so, then the display is good. On the other hand, if you can't see anything and want to restart, then press and hold down the Power button until it shuts down. Wait 30 seconds, then reboot.

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Answer 3

Aug 23, 2020 1:31 PM in response to Kappy

Thanks for reply. I followed instructions to get It to recover using the Time Machine. Every couple of minutes the Apple appears and as it switches off, the start up noise is heard and screen goes blank again. This has been going on for 10 hours now and I am not sure what to do. If I switch it off could I be damaging the recovery?

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