MB fails or processor

Hello I have a pc from a friend,and when I try to plug in the [FONT=Verdana] [/FONT][FONT=Verdana]PSU and turn up the pc NO signal from the moniotor or Keyboard.No beeps at all like some ram or smth damaged.I've putted my processor [/FONT][FONT=Verdana]on the MB and still this problem.I`ve even swapped my PSU and still this problem.I`ve tryed to reset form the battery the MB ,and reseted my MB from the Pins also.
[/FONT]The MB with no rams on it has the exactly same problem.But this pc of my friends was plugged off from the electricity 3-4 months.practically it's new.


[FONT=Verdana]Also the new pc SPECC:the processor is LGA 775, DDr 3 ,MB: MSi G41m-P26 [/FONT]


[FONT=Verdana]pls help.TY[/FONT]
 
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