definitely the bearing(s), try splashing some lubricant in there, if not maybe replace fan
Nathan604 Reviewed by Nathan604 on . I need someone who knows alot about Dell comps I have a year old Dell XPS 400 and now about once a week there will be a loud hum coming from what sounds like the fan in the front of the computer. Weve cleaned all the dust out and it still dose it anyone know if this is bad or what the hell it is Rating: 5