After successful ride on VirtualBox 3.2 stable version, today I had a issue with starting my virtual machines. The following message appeared, The VM session was closed before any attempt to power it on, then closed. Finally I managed to fix with following method. Now VMs are fine.
I tried following methods, but failed.
1) Tried several snapshots which gave me same error.
2) Restarted Host computer.
3) Stopped all VirtualBox services and restarted.
All failed, finally Google helped me to find out this thread in VirtualBox.
If you get The VM session was closed before any attempt to power it on message and Virtual Machines can not be started, don’t panic. Don’t do anything. Just take a snapshot.
Go to Storage option of VM; remove hard disks and CD drives.
Start Virtual machine now. At least now you could see Oracle VirtualBox screen but as expected boot medium error you will get. Shut down VM and add storage disks as it was earlier.
Now switch on virtual machine, which will start normally.
I didn’t try much to find out the cause. VirtualBox may come up with some fixes for this issue. But, I can confirm this method work for me.
Is this fixed your issue too?