I've just been looking at lots of similar issues to this but none have a fix that works for me.
I've got a Windows 7 64-bit Intel Core i7 system on which I'm trying to install Ubuntu 12.10 (32-bit and 64-bit) under a VirtualBox VM.
I've tried booting from an ISO and from a disc and the furthest I can get is the boot options. If I try to run without installing or install it moves on and then simply crashes it seem (just blank screen with the cursor, not blinking).
I've tried with
no acpi etc as suggested in related questions.
To test I tried installing Fedora as well and that caused a kernel panic but I couldn't figure anything out from that. I've got two virtual machines running XP already installed so I don't know if there are settings in VirtualBox that are necessary for Ubuntu which I need to set.
I'm not sure if this is graphics related, but if it helps I've got an Nvidia GTX 460 v2.
I've setup another VM to try and install Suse but when selecting 'boot from hard disk' that seems to behave the same way - it attempts to boot & just crashes on a similar screen. Although here I can't force a reboot with
right ctrl +
Virtual Box version 4.2.6
Settings for VM: http://pastebin.com/b6eQrss4