I recently recieved a used Dell optiplex 960 when i plug it in it turns on as normal the power button lights up blue no diagnostic codes, then it turns right back off. I have tried everything from switching the power cord, removing memory the hard drive and reseating them but still the same effect. When i remove the memory the power stays on but it gives the buzzing noise as if the memory needs to be placed in. so i kknow its not the power supply. The light comes on the mother board also. I just dont know what else to do. I had the same problem with an optiplex 955 thats why i got this one . can someone please help...
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