virtualbox.org

Hi,

I have properly configured Ubuntu 12.04 Guest OS on Windows OS. And it was working properly. Now, suddenly when I started the Ubuntu Guest then it's getting stuck at Ubuntu Logo and doesn't moves forward , thus not booting. I'm on Virtual Box 4.2.18 and have tried Virtual Box 4.3.2 also, however same issue occurs.

Processor : Intel Core i7

May any one please guide me on how to resolve this issue ?

Thanks.

Post the guests log file (as an attachment)
Also state what the last thing that was done while the guest was working.