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's Homepage return to normal after purchase of RememberingSteveJobs.com –
The memorial image from Apple’s homepage has now been taking down and replaced with information on the iPhone 4s. Apple have not took every thing down concerning the passing of Steve Jobs as a link at the bottom of the page to the page which includes thousands of tributes sent in from fans. Apple have also invested in the domain RememberingSteveJobs.com which directs straight to Apple’s Remembering Steve Jobs Page.