I have just received my new 8400. It came with a 160 hard drive. I have a 250 gb hard drive that i used in another pc. But when I open the 8400 up, it looks totally different inside. What I mean is the data cable I'm used to seeing isnt there. My 250 gb drive is a maxtor ultra series ATA/133. Will it work in my 8400? If so what do I need to do.