so I installed a 2nd graphic card, installed the proprietary driver for it (nvidia quadro), but now when I boot the computer, the purple screen loads for a while and then all I get it's a black screen with a blinking cursor.
I've taken the 2nd card out but it doesn't change anything.
I am preparing a usb stick to boot from it and try to access my system: is there anything I can do to fix this?
it's a ubuntu 13.10 64 bits