Root Nothing works!!

I've tried just about everything, rooting applications that are designed for the Inspire, and ones that aren't. Everything I try fails. I've been at this now for four days straight. I've even tried manual rooting over the Terminal, which I am very experienced in, and that still didn't work. Is there something that absolutely 100% works all the time??? I have Mac OS X, Ubuntu, and Windows XP - 7. Thanks in advance!