I recently swapped out an old ATI video card for a newer Nvidia card. The card seems to be working just fine and I can get a GUI with some effort.
However, the new video card seems to have broke GRUB. When I boot up, the GUI is no longer automatically selected. Instead, all I get is a flashing cursor. I tried switching to one of the other terminals (CTRL+ALT+F1) but there is still a flashing cursor. Although I can successfully switch to the GUI via CTRL+ALT+F7 and log in.
How can I fix GRUB and boot up to the GUI directly again?