Unrecoverable Error
A friends MacBook Pro will not start and when switched on displays the following Error M<essage -Security Agent was unable to create requested Mechanism MKAuthPlugin:prelogin -
I have tried numrerous suggested cures for this problem including a reinstallation of the MacOS which takes about 90 minutes to download, after the download the above mentioned Error Message is again displayed. I would be most grateful for any suggestions to sort this problem out.
Many thanks
JohnD