hardware help Off Topic

After swapping memory DIMMS on a friend's computer, the computer 
refuses to power up.  It has a push-button switch on the front which 
has to be held in for four or five seconds to power down and one push 
normally powers it up.

The power cord on the back is okay (tried another cord) and the front 
panel switch is working (used an ohmmeter) and the power supply is at 
least partly working as there is 3.7 volts on the pin labeled "power 
on" on the power supply when it's unplugged from the motherboard.

Can't seem to find any help on the web.  Does anyone know enough about 
these newer power supplies and how they are turned on to suggest a 
solution?  I don't want to have to buy a new motherboard.
bruce

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