Ubuntu's main bootup only returns blank screen, systemd bootup works fine

I use Grub to boot between Ubuntu and Windows. The options are somewhat like 1. Ubuntu 2. Ubuntu (Recovery Mode) 3. Windows If I choose 1, it shows the Ubuntu logo, the little balls under it flowing. Then just a blank screen. I can't even get into a text terminal by pressing Ctrl-Alt-F1. But if I choose 2, and then choose Ubuntu (systemd), everything works just fine. I log in, everything runs. I'm no Linux expert but I believe the only two differences is that Option 1 uses Upstart instead of Systemd and vice versa. Personally, I don't care which my system uses. I'm just trying to get my default choice to work again. Any thoughts?