My MBP is having some big problems with internet. Some websites it will not load at all. All that would show up is a small black box in the top left corner of the page. Another problem that recently started was WoW is always in the red on the lag meter which it has never been before without me getting booted. have tested everything on different networks with the same results. I have no idea where to even start to fix this issue any help would be greatly appreciated.