I have an old 2007 Black MacBook. Randomly one day my old charger stopped working and I thought it was broken and threw it out and got a new one (Stupidly didn't test it on other computers). Now here are the problems. This new charger worked for 3-4 days and has suddenly stopped working. It does charge my siblings macbooks and for some reason their old chargers work on mine, however, i feel its almost inevitable for their chargers to die on me if I use them. Does anyone know what the problem is or how to fix it?