Q: My computer kept turning randomly without me doing it. My dad thinks it is the mother board. He is going to replace it. What is that? Does that mean I will lose all my computer memory? What is going to happen?
A: No. It is your main board, the backbone of the computer to which all other items connect - such as your harddrive (where all your data reside - so you are safe), video card, sound card etc.. So, not to worry. If he knows how to do it, I do not think he will bugger it up. Have trust in him.