Problem with Linux mint 17.2 boot

I have installed this once already but had problems after loading and formatting a iPod shuffle with Rhythmbox. This mint 17.2 seems to be a lot more compatible with my MacBook Pro than the Ubuntu 13.04, but during the second install I am having problems during boot up. I am getting a black screen. This is a single boot system. prior to installing mint the first time I formatted my drive. I just ran boot repair but it indicated that I had a problem (cf. pastebin) . If anyone can help, it would be much appreciated. I am not too familiar with the Linux boot process. When I loaded it the first time I partitioned the drive in three parts: a boot sector sda1 then sda2 for Linux and the swap sector.