Sponteneous Shutdown

I built a PC for a friend a couple years ago using components I ordered from New Egg (don't recall the specs but can get them if needed).  Recently the machine started displaying the following behavior:  

When the computer is off and the power button is pressed the boot process begins but within a second or two  the system powers down.  It will do this every time until the power switch on the back of the power supply itself is toggled off and then back on.  Once that's been done the computer will boot normally when the front power button is pressed...until the system is shut down and then the scenario repeats itself.  Thoughts?
psych0nautAsked:
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phototropicConnect With a Mentor Commented:
Sounds like you need a new PSU. Try to swap the one you have for known good. If the problem resolves, replace it.
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jamietonerConnect With a Mentor Commented:
Check the motherboard for bad or leaking capacitors (http://badcaps.net/ident/). This is usually cause by a bad psu or motherboard.
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