Please help,i'm trying to erase my hard drive on my Mac mini model # A1283 and start it as new again . My kids have messed around with this computer so much that it is running horrible I have nothing on it that I need to save It's just the house computer. I went to disk utilities but it won't allow me to click the erase button. I don't know where the disk is that I was supposed to save and all I have is the computer can someone show me how to erase the hard drive so I can start the computer as new again.