Major login issues on just my main account

I havn't been able to log in for four days now on just my main account. My alt works just fine, but my main freezes up. When i used to log in i had to clear cache every single time or i would not load and get disconnected. But now it won't load at all. If i wait long enough at the login it will eventually login but i'm immediatly disconnected. I can't move or do anything with what i have. Its been this way since the blackout... i don't know what else i can do to try and fix this. i've cleared all cache, set graphics to lowest setting, and reinstalled SL. nothing works plz help!