Share 'HELP! I can't get into SL'

Well folks, I still can't get onto SL. It's been almost 3 weeks of taking my puter apart and checking everything known to man..or woman. I don't know how to fix the problem. It worked great and then NOT! I even replaced my graphics card thinking that might be the problem, but it isn't. It's a new puter, everything way over what is required to run SL, and everything else works...movies, other ga...