After 2 years the toggle on my modem lead has broken. This means it falls out of my laptop all the time. Easy to get a replacement but the thing I notice is, the lead supplied is 2 core, using the two outer slots at the wall and then changing to the two inner ones where it enters the PC. The only leads I can see are 4 core at each end. Bearing in mind the way the cables swap at each end it is not just a case of breaking off a couple. I have tried the 4 core and it works but the retailer said it may work sometimes and not others. Sounds daft to me but why would they create the lead supplied. Also the laptop has 4 of the connections in the slot to be seen anyway. Any ideas, could it cause damage using the standard 4 core?