Hi wise souls of computing. One of the creative problems going on with my recently built computer is that the fan in the power supply no longer works. Nor can I use the power button to actually turn off the machine anymore. When it gets too warm in fact, I must flip the switch on the supply in the back..its scary, but so is overheating. While I am still hunting for sighted help to fix the mess my prior contact left behind..the cd rom is disconnected too, I want to plan properly for the power supply replacement. I have several, including at least one still in the box. I am quite sure that the power supply capacity is too low for the several things the machine is doing, I have three hard drives in the unit, several internal boards in use those kinds of things. Is there a guide, or rule of fun, for determine how much power capacity a supply should provide based on how much work the computer processor will be doing? With appreciation. Karen