So here's the situation: I'm trying to install Mint on a windows 8 preloaded UEFI laptop from Medion (model ERAZER X6823). I'm using their livedvd which I've heard uses the same grub as ubuntu, with efi support.
Restarting with the DVD inside brings up the grub menu in efi mode as expected (not the usual distro graphics when installing): three options, start mint, compatibility mode start, or integrity check. Choosing either normal or compatibility start leaves the screen blank: the backlight is on so the problem doesn't come from bad screen hardware recognition I think. The computer is a laptop so not sure if the screen would display incorrect refresh or resolution if that was the problem, although I'm pretty sure it isn't, from what's next:
The computer reads the dvd for about 20 seconds, then the dvd reader stops, as if there where no additional read commands (unusual as booting has so far taken several minutes with a lot of noise from the dvd device with older computers). I think the computer doesn't reach logon screen: I don't hear the logon music, and so I think the problem is more about the boot than about graphical bugs.
I have turned secure boot off (read recently this wasn't necessary), turned off quick boot in the bios as well as through windows (hibernation) as well but left uefi mode on as it was necessary to get the ability to dual-boot win8 and linux as I've used to before, or so I've read.
My specs are nvidia 670mx, intel core i7, regular hdd (don't know manufacturer, but it's not a ssd). I have optimus tech with the graphics card. The computer is brand new.