If the fan starts and there is no beep. considering that the speaker/buzzer is working. I think most of the time it will be Motherboard or Processor. But is there anyway to know which is faulty. For home users it is very diffcult to know what is faulty as we do not have extra processor or motherboard to test. Taking it to a service center for testing again cost some money. I have seen something like PCI Card (used to diagnose problems) which is attached and it displays some Hexadecimals (i beleive) Numbers which i think are memory locations. Does anyone know of this? where can i get one ? what is it called?