Buzzing sound at start up and 2 green numbers light up number 3 and number 4
See solution in http://www.fixya.com/support/t1372311-start_up_fault
3 and 4 green lights indicate the memory or the slots are bad. Move the memory to different slots and or change the memory.
I had the same problem on my Dell. It is either a video card or motherboard failure. I would try a different video card fist. If that doesn't work you will need to call Dell for a replacement motherboard as Dell does not use industry standard boards in the 5150.
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I had the same problem with my Dell Dimension E510. It had the buzzing and the 3 and 4 lights stayed on and the monitor had an orange light and didnt come on. So I took out the memory cards , cleaned the contact strips with a pencil eraser, snapped them back in and walla, it works now. I dont know if the eraser helped but this is how I cleaned memory chips for controllers on large metal presses where I worked. Thanks for the info. This made it an easy fix. All I did was google the words buzzing, computer , dell , wont start . Richard
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