What are white indicators? Do you mean the Brakes and Accu press indicator or something on the ECAM gear page?
In any case I would do a brake check, if brakes work normally (pedal press), if not, you still could think about the by-heart-item about Loss of Brakes.
I guess if the accu press indicators go up thats a sign that they were low before and if the parking brake indication goes up it's a sign that there is a problem in the parking brake, if noone touched the park brake handle.
Is this a quiz and you know the answer or is this a real question?
Dani
(I guess skippers and first officers are allowed to answer...)