TI-nspire CAS screen problems?

[julie9300]

So i dropped my CAS calculator for probably the billionth time a few minutes ago, and now when I turn it on, occasionally the screen just flashes (turns off then on). Though it only dropped on carpet (I've dropped it on tiles and concrete before and the calculator worked perfectly fine afterwards). I checked the batteries and there's still 50% left.
Has anyone had this problem before?
My trial exams are soon and I'm just worried that it won't work half way through my exam.