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 N90 iPhone Prototype Video & Ebay Listing
Today an iPhone 4 N90 prototype surfaced on eBay and also included a video on YouTube. The iPhone backplate has a unseen before logo replacing the Apple logo does this mean this is the logo used on all prototype devices ?
The prototype has a couple of minor changes including no screws at the bottom and a little larger speaker and microphone
Update : The listing has been removed from eBay.