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Computer will not boot

I have an ACER computer that when I saw it for the first time, the screen was black and the computer would not shut off via the power button on front (Hold for 15 secs), so I had to pull the plug on PS.   The first issue with the computer was when it was shut down then started the next day, only "No Input" on monitor.   I opened up case, reset RAM then pushed button and the computer would not even turn on.  I replaced with 2 other power supplys but they just get the fans started for 2 secs then it shuts down and wil not even get that far until I leave the tower sit for a few minutes.   Every other component is unplugged inside and out except the power cord and the monitor cord.   There is no "post" becasue it only starts up for 2 secs or less.  Is this a fried motherboard?   Runninfg Windows Vista with an AMD Athlon 64 x2.
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Hashim Nangarhari
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computer would not shut off via the power button on front (Hold for 15 secs)
usually when i encounter such problem it turns out to bad CPU
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I checked for bad capacitors, none showing.   I took out board and just had board, processor and RAM conected, same issue.   I replaced RAM and tried one stick in each slot at a time, no change.   I am replacing the computer tower due to what seems faulty Mobo and/or Processor.  
Thanks for confirming suggestions