I suspect that you have swallowed a magnet. It's the only way to explain the computer issues AND the TV.
Here's a place to start trouble-shooting: on one of the times that it DOES let you in, how about changing your password? Heck, "change" it to the same one you are using, but if you re-enter it and then update, maybe that will solve your problems?
Here's how, in case you're not sure:
Up above, choose "Manage", and then "Update Profile". Click the edit icon next to your password. You may have to confirm with your current password (let's hope this is one of the times it will accept it). Then type your new password, confirm by typing again, and hit the Update button.
Let me know how that goes.