I had an old computer my son was using for general surfing, etc. For about a week now the CPU fan was making noise.I was out of town for a few days and when I got back, the computer wasn't running. If the fan went, would it stop the computer from operating? I'm pretty sure it isn't the power supply as it tries to fire up for about 2 seconds, and then shuts down. Usually, if a power supply is hooped, you get no response(dead). Anyone got any ideas? Is there a way to test to see if it is the fan?