Can't use a splitter

We recently had a lightning strike that fried the modem. I got a new modem and when I hooked it up internet wasn't working. I disconnected the splitter and hooked the line coming from the street directly to the cable going to my modem, It worked fine. When I connect a splitter, I have no internet. The only splitter I had was on the box at the side of the house, there are no other splitters in the house. I've tried replacing the splitter with several different new ones and none of them work. I have noticed my upstream power levels are really high, +58dbvm. Could this be causing the problem?