Portal wont load on vx2 box


Hi, just bought a vx2 box with a sub already on it.... The problem is that the portal dosent seem to load, when I press reload portal it just goes to a black screen and nothing opens.....My supplier says to try a different media player,, but that dosent seem to work..... I did get it working when i tethered off my phone, but I cant see it being my internet because I am running a mag box off it!!! Anyone any ideas, or have you encounted this problem???