Disk so I can sit & look at the floor to ceiling pile of old games & instantly install any of them that struggled to run originally & replay them with my spanky new top end Graphic card, added to that I can look at the huge fat manuals that come with DVD versions 
It was working fine until all of a sudden when I went to put it on it wouldn't start properly! The comp starts up for about a second and the fan starts etc then it cuts off.. It will then come back again only to again, cut off. I have used different wall sockets, power cables and checked my connections in the case and still nothing..