I burned two ubuntu 12.10 amd64 images: one from the official site, the other one is ubuntu secure remix
They both did not work because when I hit enter on either "try without installing" or "install ubuntu" the monitor turns into the black screen with a flashing underscore cursor in the top-left corner and freezes.
My computer is an Asus g75vw laptop with i7 processor and gtx 660m. I am trying to dual boot ubuntu with windows 7 pro 64bits.
Thanks in advance!
Edit: I have done the checksum by this instruction. The sum are the same.