hello, I started an update I think it was osx, and just before it was done, it asked for my password, and I tried entering mine, but it would say that something was wrong with the server!! kept trying and it wouldn't work. so I click on the arrow to go back a step, and that was yesterday, it hasn't opened any other page!! it is stuck in that place! nothing to click!! and I have tried shutting off, restarting, and even making the battery go dead!! but nothing!! I do get the box to click on shut down or restart, but when I click it says " the application preview canceled shut down."
I don't have any menu or bar to click on! just a blank white page and nothing else on the screen!
I am new at this, I don't know what to do!? please help me. thanks.