I have a Dell Dimension 8400 with xp. When I press the start button the assembly fan (the one with the green shroud) roars like a jet. No lights, bo beeps come what so ever and windows will not load, just a black screen. Tech said I needed new hard drive. Bought one- still does it. Bought new assembly fan and shroud- still does it. Cleaned whole machine good. Heat sink appears to be connected well. What else can it be? I've read it could be motherboard or cpu but I don't want to keep adding $ if it is better to buy new computer.
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