Boot up the virtual machine and it should all be working with the Guest additions installed.Then go into the Virtual machines settings as before and tick the 3D Acceleration check box and hit OK.During the install you will get the black screen as before, that’s normal, just wait a few minutes then turn off the virtual machine from the VirtualBox menu.Then boot up the Windows 8 Virtual Machine and install the Guest additions.Also ensure that the Video memory is set to 128MB.Before installing the Guest Additions untick the 3D acceleration tick box in the display properties from the VirtualBox menu.This solution does not seem to work for all, but I have heard from a lot of people that it has worked for them. Thanks for this tip as I was unsure of how to get into safe mode in a Windows 8 Virtual Machine without pre-enabling it. This can be done apparently by disabling the network in the VirtualBox settings, which then gives repair options when you boot the Guest OS, one of which is safe mode. Update: rseiler posted on the VirtualBox forum stating that another option if you are already getting the black screen issue before trying this fix, then you can uninstall the Guest additions by going into safe mode. It needs to be done before installing the Guest Additions and getting the black screen the first time, if you already have the black screen issue you will need to either restore from a snapshot before you did this or a reinstall the OS. I have managed to work out a solution that works for me, but this is not to say it will work for everyone. The problem seems to be related to the graphics driver and the handling of 3D acceleration. The symptoms are that and the ability to still alt-tab and see things before you restart for the first time. Unfortunately some people (including myself) have been having a problem that when installing the Guest additions the screen goes black and then doesn’t come back even after a restart. VirtualBox has now been updated to support Windows 8 with the Guest Additions which solves the problem of the weird resolution problem that you get when installing a guest OS without the proper VirtualBox drivers.
I recently posted about installing Windows 8 on VirtualBox which at the time was at version 4.1.8 and the Guest Additions did not install.
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