There have been several times in my computing career when a power supply or other component has died on me. When something is going wrong in your PC, it is good to know what is going on inside the box. You can get out your candy thermometer (or your significant other's I suppose) to test for PC component temperature or a great program to help test your systems heat and other PC vital functions is SpeedFan. This tiny app is great, giving you vital info on heat, fan speed, hard disk fan speed, and other information you may need in the process of troubleshooting. SpeedFan won't give you info on every component, but it certainly helps when troubleshooting heat issues. It has some features that over-clockers would make more use of, though I haven't tested them out yet.