Answer to "A flashing question mark in a folder"I had the same problem. And after trying almost everything I finally find the solution, very simple by the way. By turning off the computer and removing one of the memory ram card, turn on again and it will go straight like nothing, do your settings and turn off again and add again the removed ram. Good luck
Answer to "White screen after repair"Just press at the same time power and home botton for ten seconds and wait to see Aple logo. BUUM!!! it's done.