I just moved into a new apartment, set up new internet and router, but I have trouble accessing a lot of websites, like yahoo.com and facebook.com. All my friends are using PCs, and I'm the only one on Mac. None of their computers have trouble going to the same sites, but I'm stuck watching a blank screen. I researched around, but I cannot find a solution to this. I've tried pinging websites, running the command line to flush the DNS cache, but nothing has worked. Is there some sort of system preference I have to set on my Mac, such as lowering security features, to access the sites I use the most? Any suggestions are welcome! Thanks a lot!