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first take off turn off the machine
remove the side panel and then turn on the machine
now closley listen to where the sound is coming from, it could be the fans on the motherboard or it could be the hard drive spinning up. once you have determined where the 737 wanna be is, you will know what needs help ok?
best regards mike
Replace the power supply. 70 to 80 percent of the computers that come to my shop are dirty inside, and the power supply has failed because of this.
Even if you get a green power light, your power supply isn't supplying enough power to turn the processor on.
All the lights use less than 1 Watt. EACH fan uses 2 to 3 Watts Harddrive just sitting there spinning, uses about 3 to 5 Watts. When it's time for the processor to turn on, the power supply can't handle it. Not enough power! Processors use 55 to 125 Watts, depending on the processor!