Unable to access a website that I have been able to access before?

I am going nuts trying to figure this out. I go onto www.monkeyroyale.com on a daily basis up until 4 days ago. Now I get a "page cannot be displayed message". I talked to my isp, and they said the problem is with Monkeyroyale, but MR says that they dont have me blocked, and everybody else is able to access that website but me. I am a computer illiterate ! Can someone please help me ?