Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Apple Delay New iPad Shipments To Uk Until March 20 or 21 For Customers Who Pre-orders –
Apple announced earlier this week that they would be shipping the New iPad to customers in the UK on March 16th but we have heard from multiple people out there who pre-ordered the new iPad as soon as it was possible that Apple have now sent out an apology letter which says that they will not receive their new iPad until March 20 or 21
Despite our best efforts and those of our shipping partners to get your order to you on time, we want to inform you that it will not arrive on its originally scheduled delivery date.
Your new delivery date is 20/03/2012.
Once you receive your Shipment Notification email, you can check the delivery status of your order by clicking the Track Shipment button, or by visiting the Apple Store and clicking Account.
We regret the delay and apologise for the inconvenience.
Apple Online Store