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Did you connect all the wires right? There may be a 4 pin connector to plug into the mobo along with the 20 pin connector. Make sure it's plugged in and the switch on the back is on.
 
Are you getting any power to the motherboard?

If the power supply is plugged into a power strip, is that turned on?
 
LOL. That answered my question. I was wondering if it was even powering up and getting power to the mobo. I guess I should have put it that way in the first place.

So you push the button on the case and nothing happens? Check to make sure the wires to the power button are connected to the motherboard. if they are, and it's still not powering up, you can test the power supply using this method: How To: Jump Start A Power Supply (PSU) / Test A Power Supply And Components
 
ok that worked and i tried it on a different computer and it turned on
now it still doesnt work on the compaq
 
The only thing I can think of is to make sure all wires are connected properly including the one's going to the front panel of the case.
 
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