Usually, view your account with a browser in incognito mode and look at your comments. I do it every now and again, just to make sure.

Also, addlepate, you've been hellbanned:

    addlepate 8 days ago | link [dead]

    Are you sure about all that? I never get votes or replies. Also, as implemented, 
    HN's hellbanning is quite obvious when it happens.

Clearly not that obvious.