disconnect all the printers, etc and leave it with keyboard, mouse. try it and still no joy try it by posting....that means take cover off, try removing memory and start computer, if it beeps it's memory, if not replace memory and take out VGA/Graphics card....if it beeps and whirs into life it's VGA and replace card...if not could be hard drive.....try it with a back-up hard drive if you have one spare....most motherboards have a green light that either stays green or turns red if motherboard if faulty , usually under a plastic cover at corner of the board....hope this helps
