virtualbox.org

I had a Windows 8.1 on my virtualbox, after my debain crash I installed ubuntu mate and wanna open that virtual windows again
I made a new virtual machine and selected Using Existing VDI but the virtual machine stocks on a black screen on start up...
it's really important for me, would you please help me run this VM

I split your post from a 2011 unrelated thread in the Windows Hosts section and started a new topic, as you could have done from the beginning.

So, your Debian host crashed (how?), you installed a Ubuntu host. You have a Win8.1 VDI (only?) from a backup(?) and when you create a VM around that VDI, it doesn't work. Is the above info correct? Can you fill in the questions?