I'm replacing my motherboard and processor. I have the Intel Pentium E2200 dual core processor and a EVGA e-7050/610i Motherboard - Socket 775. 

When I first turned on the power supply switch after replacing and with only memory connected (no drives or other add-on's), the PC reacted as expected, waited for me to press the power button.  When I did that, I didn't get my usual POST screens so I shut it off by pressing the power button for 5 seconds and it shut down.  I did some checking of jumpers, connectors and turned power on and off using the power button.  I left the project for a few days and when I started checking again, I found that the heat sink fan was loose on one corner and so fixed that.  

Now with nothing connected except memory, when I turn on the power using the power supply switch (not the power button) the fans all turn on and the PC acts as if it is powered up.  The power button now has no effect.  

I'm asking for for your guesses as to whether the the CPU is bad or the motherboard?  I'll probably end up buying both but I'd like to try one or the other first.  The question is whether I should try a new CPU or Motherboard first.

Thanks for any opinions.

Doug

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