i have a 2009 macbook and my dog chewd the cord of my charger, it left some of it exposed but no biggie, still worked, sometimes i had to wiggle it around for it to work, 1 year later and after a failed hard drive partition, my macbook is DEAD slow, i took it to a friend of my mom and he said the chewed cable damaged the entire laptop and i had to buy a new one, i think its just a hard drive problem, can a damaged charger destroy my laptop? ty in advanded