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Question: Unable to install High Sierra

After downloading High Sierra to my iMac (which takes around 1 hour) I select the hard drive to install it on and a message on screen says calculating installation time. After a few minutes I get a black screen with a white circle with a white diagonal line through it (no entry sign) Restarting using command + R and selecting reinstall Mac OS Sierra works fine all back to how it was. Apple support do not have an answer for this issue, anyone had the same problem and hopefully a fix.thanks.

iMac (21.5-inch, Late 2013), macOS Sierra (10.12.6)

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Nov 17, 2017 3:49 AM in response to macsync3 In response to macsync3

So the white circle with the white line through it is a sign to say the install could not find a valid file system. Before doing any upgrades or OS updates it is wise to run Disk Utilities First Aid to check for any directory/ disk errors.

However you managed to restore your mac to Sierra, so hopefully you will now be able to install High Sierra.

Before you upgrade please check that any third party apps you use are compatible with High Sierra, https://roaringapps.com/ and also check to see if any printers/ scanners or other hardware you use with your mac has updates to drivers or software available for High Sierra.

Nov 17, 2017 3:49 AM

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Nov 17, 2017 5:06 AM in response to Eau Rouge In response to Eau Rouge

Many thanks for your reply, I have followed your suggestions but sadly still got the no entry sign, reinstalling Sierra again as I type this. Very strange - Apple support seemed mystified by the problem! Do you think the fusion drive could be the issue? Thanks

Nov 17, 2017 5:06 AM

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Nov 17, 2017 5:51 AM in response to macsync3 In response to macsync3

High Sierra should install on a fusion drive, it just won't be able to use the APFS file system so will just keep the HFS+ filesystem we've all been using for years.

Can you have a look in your Application folder fo Install macOS High Sierra.app, make sure it is about 5.12Gbs, if you find it you could then download this, http://diskmakerx.com/ and make a bootable USB installer. This will ave you having to keep on downloading via the App Store. If you can't see the installer app you will need to download from the App Store once again, when the installer starts just quit and then make a copy of the install app and the bootable USB.

One booted from the USB select Macintosh HD (or whatever you have called your Sierra disk) and see how it goes.

Nov 17, 2017 5:51 AM

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Nov 18, 2017 8:02 AM in response to Eau Rouge In response to Eau Rouge

Hi, I have tried installing from the usb boot drive and the download from the App Store neither work, just come up against the no entry sign every time! Fed up with trying so reinstalling Sierra again and will wait for the next high Sierra update to be released and hope that works 😔😔

Nov 18, 2017 8:02 AM

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Nov 18, 2017 8:15 AM in response to macsync3 In response to macsync3

Well that is very puzzling indeed, I can't see why Sierra can install but High Sierra won't.

I take it you are trying to install over Sierra or are you wiping your disk and then attempting to install High Sierra.

If you are doing a 'clean install' remember to format your disk as HFS+ Extended (Journaled) on a GUID partition.

Nov 18, 2017 8:15 AM

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Nov 19, 2017 1:29 AM in response to Eau Rouge In response to Eau Rouge

Hi, I have tried doing it both ways, took it to my local Apple store they spent 3 hours and still could not get it to install!

They suggest waiting for next update to be released or purge the hard drive which I would have to pay for. Not very happy 😡😡 thanks for all your help.

Nov 19, 2017 1:29 AM

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Nov 19, 2017 5:03 AM in response to macsync3 In response to macsync3

So was that an Apple Retail Store or just an Apple authorised reseller?

I find it strange an Apple retail Store would charge you fo installing an OS.


If you are now back to Sierra you could download this and run it on your disk, there is a free trial. https://binaryfruit.com/drivedx

Nov 19, 2017 5:03 AM

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Nov 19, 2017 6:48 AM in response to macsync3 In response to macsync3

Well it is a mystery, I am at a bit of a loss you could try asking the same question over here, iMac in case someone has come across a similar problem on the same hardware.

Did the Apple Retail Store say what they meant by purging the hard drive.

Nov 19, 2017 6:48 AM

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Nov 19, 2017 7:42 AM in response to macsync3 In response to macsync3

I had something similar happen and was able to fix it by restarting in recovery mode and reformatting my hard drive. That symbol usuay means that your computer can’t find an available hard drive. Most likely, either your hard drive was not formatted correctly or it was not mounted.

Nov 19, 2017 7:42 AM

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Question: Unable to install High Sierra