boot - How to install Ubuntu 14.10 on a new Lenovo Ideapad g50-70

I’m trying to install Ubuntu 14.10 (64 bit) on my new Lenovo Ideapad, but I can’t seem to boot from CD or USB.

I have disabled secure boot and fast boot in BIOS, boot mode: legacy (not UEFI).

I created a USB installer from USB-creator, but when I restart with USB, I just get a black screen with “Lenovo.” The same happens with the DVD.

Perhaps I need a special format while creating USB installer?

Or maybe try to do it with UNetbootin?