This happened to me twice before, each time lasting about 3-4 days. I cleared cookies/temps/ect and nothing worked. It did however work from another computer. The computer I was trying to login from was on a wireless connection and Im pretty sure that I wasnt getting a strong enough signal (or thats what they said). So if you have wireless internet by chance, its probably that. I was having the same problem...would get onto the main page fine but I couldnt log in.