I have Windows 7 64 bit installed on one partition (the rest of the disk is unallocated). I made a live USB with the latest official Kubuntu 14.04 64 bit ISO. When I boot, there are two USB options: with UEFI or without. I have Windows 7 in "legacy BIOS mode" so I choose the one without UEFI.
When I boot into this one, I briefly see a splash screen (similar to this, but a black background), then the screen goes blank and enters sleep mode after a few seconds. Why does this happen and what can I do?
Note: I have also tried booting into the "UEFI: Sandisk Cruzer" option to see if it works. Installation starts normally (the monitor doesn't sleep etc.) but it doesn't recognize that Windows 7 is there, it thinks the entire disk is free space.
Thank you in advance.
Edit: After some more messing around and BSODs, I got my computer to work as I wanted (though I never found an exact answer to the original question). In case it helps anyone:
I followed this guide religiously. Part of it is to correctly put Windows 7 64 bit on a USB, where it links to another guide. I had trouble with it from another computer that has XP (the GPT option didn't appear), so I ended up installing Windows 7 non-UEFI, in order to make a UEFI Windows 7 USB in the first place. It was messy, but it worked. Then I installed Kubuntu with UEFI, it recognized everything well, and manual partitioning automatically chose the mount point of the EFI partition which was created by Windows.