HT204308: Find the serial number of your Apple product
Learn about Find the serial number of your Apple product
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Feb 14, 2014 7:10 AM in response to 23tonytby Antonio Rocco,You did 'set up' a keychain as soon as you used a password with any of your service accounts - iCloud, E-Mail etc. This is done for you transparently and is part of what the OS does. The problem you're describing is more than likely co-incidental and nothing to do with the deletion of your keychain. It sounds more like a hard drive error or, less likely, a recent update - possibly firmware - did not 'take' properly. Make an appointment at your nearest Apple Store or Authorised Apple Repair Centre and get it looked at.