Hi Brian,

Authorise your computer in iTunes. 
Have you tried:
1. Reset your computer's NVRAM
2. Boot your computer in Safe Mode
3. Log into iCloud / Apple ID
4. Reboot into Normal Mode

Cheers,
Ronni

Sent from Ronni's iPad4


> On 20 Oct 2015, at 11:54 PM, Brian Risbey <risb...@bigpond.com> wrote:
> 
> He all,
> 
> I have OS 10.11, running,
> I can use my iCloud password on my mobile devices to gain access to iCloud 
> account and iTunes, 
> but
> I still can’t sign in to iTunes on my MacBookPro, in iTunes or the App Store.
> I have deleted and re-installed iTunes a few times, and just tonight 
> reinstalled the system 10.11 via restart , tone, Command+R, 3 hours later and 
> no change/ improvement.
> I have tried un-authorising the MacBookPro, now it isn’t on the list and 
> iTunes just hangs when I try to sign in, I need to force quit  to get out as 
> menus just grey out, App Store just hangs too. After all this now change of 
> status.
> 
> I can internet search and mail is working perfectly so it isn’t my connection 
> causing an issue.
> Is there a need for a clean system install with expert assistance?
> 
> Am I missing something?
> 
> Brian
> 
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