OK, so it seems this question has been asked before but not successfully answered. I have a Windows 8 Toshiba P75-A7200, and I've disabled Secure Boot, Fast Boot, and Fast Startup. Still, when I try to boot a Ubuntu 13.04 USB installer, I get to the GRUB screen and when I select "Try Ubuntu Before Installing," it hangs on a black screen. I had also tried booting in Legacy Mode, and it was the same.
The answers that I've seen haven't helped me, since they seem to assume I can access the Ubuntu terminal?
I've read this: My computer boots to a black screen, what options do I have to fix it? But disabling secure boot and enabling BIOS Legacy Mode didn't help. My computer doesn't have an UEFI/BIOS option; only UEFI or BIOS.
Same with this: Installing Ubuntu Alongside a Pre-Installed Windows with UEFI It suggests the same things, which don't work.
They both assume that I can get to the Ubuntu installer. I've also tried to install Linux Mint, and it was still unresponsive. I used 64bit for both, of course.
So Ubuntu is supposed to be able to work with UEFI and secure boot. What's going wrong?
PS It is a black screen, not a purple screen, so I don't think the problem is my video drivers, because I've had that happen on another computer. I know the problem is the UEFI, since I've installed Linux on three other Windows 7 computers just fine.
EDIT: dd just try to switch to nomodeset, and that took me to the ubuntu command line. I tried startx which resulted in an error, so I am lost on how to proceed?