I had exactly the same thing happen with a Mint 15 install from a stick. Turned out to be a faulty stick. A fresh install from a new stick worked a treat.
Perhaps a new disc?
Could anyone link him an iso of the disc? Or you could grab Mint 15 from their site...
i5 4440 3.1Ghz, Asus H87M-E motherboard, 8GB DDR3, 2GB DDR5 nVidia card, 2x500GB Seagate hd, Coolermaster 750W PSU running Mint 17.1 MATE and Win7
HP mini, 1.66 Ghz Intel atom processor, 2 GB DDR3, 320 GB hd, Mint 17 MATE