Having 7 computers on a home network, something has to give. the server stays on 24/7 but the others go up and down. Using two dell 690s, well, in the winter I dont have to use heat when they are on and they definately go off in the summer! However, there is a lot of truth that the most stress on electronics is the inrush on power up. Generally speaking, if it's going to fail, thats when it will do it.