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MoBo power light on but will not power up

I have a DELL PC from a new client.  The power light is on on the motherboard, but it will not power up at all.  I don't even get the usual "I've got power going through me" sound a PC makes when you first plug in the power cord.

I've tried a new power cord, a new power supply, unplugged and plugged in the power switch cable all with no luck.

Any ideas?
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Callandor
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I've pulled out all the cards and nothing has power fed into it except the main MB and the small connection next to the CPU.
Try resetting the CMOS with the motherboard jumper, or remove the CMOS battery for 10 min.  
Does it have a separate video card?  If so, try another video card.
Try different RAM modules that you know work.

If these don't work, I am inclined to think it's a bad motherboard.
I pulled the CMOS battery out for five minutes with no help.  Changed vidoe cards, nothing.  Pulled all RAM, nothing.  Pulled off fan and heatsink for CPU, just to see a possible reaction, nothing.  Even went so far as to pull the CPU for a reaction, nothing.  I'm chalking this one up as a bad MB.  If anyone has any other suggestions, I'll be glad to hear them.