I am fixing a laptop for my grandson . i took it apart to change the cmos battery but i can't seem to find it. i just hate to take all the ribbons off . i am afraid i won't remember where everything goes. where is the cmos batter located? i wish it was easier than this. too many screws. i need some help in getting to it so i can change it. i don't know if that is the problem but i am going to try.