Are you sure you didn't make the very common mistake of forgetting to plug in the 4-pin CPU power connector as well as the 24-pin motherboard power connector? The 4-pin CPU power connector is located near the CPU socket.
oops Zip I think so based on it is an old case from way back Cheiftec full tower and I have no literature on it and couldn't find anything that stated wiring diag. It seems that the hot lead is colored versus the ground being black on all four of the front connections well the power switch is a green(positive?) lead and white(negative?)
Is everything within your case dead? I mean nothing at all turns on? I see you posted that the keyboard lights up momentarly, but that the power supply fan doesn't kick on. Something doesn't seem right with your discription. Can you please explain exactly what is and what is not turning on?
haha, its ussualy the simple things that kill ya. Even I overlooked that being a posiblity here lol, but still a very valid thing that it could be. Also this simple mistake has made me think that it could be possibly that there is a voltage switch on the psu. Depending on where you live (usa 120v eurpose 220v) determines what range of voltage comes out of your wall.
What did you do to make the keyboard LEDs light up, however briefly? Obviously, the keyboard derives its operating power through the motherboard, so SOME power is available. It almost sounds like the standby power is active, but the PSU isn't receiving the turn-on signal from the motherboard.
To quickly check if the PSU is "alive", turn off the PSU and disconnect it from everything except the AC power. Force it to start by shorting the PS_ON signal (pin 16 on the 24-pin power connector, usually the green wire) to ground (either pin 15 or 17, or any black wire) with a paperclip or jumper wire. The PSU fan should stay running as long as you keep PS_ON shorted to ground.
If that works, reconnect the PSU to the mobo in the minimum system configuration I described above. Make sure you have the system power switch connected to the correct front-panel connector, and try again. If this doesn't work, your mobo might be DOA.
Hey keyboard can sometimes light up when PSU is plugged in just due to residual power, plug everything in make sure all connections are secure unplug the front panel switches from mobo ( Pwr Swtch, Reset Swtch) Take a philips head screwdriver, locate all the front panel jumpers and touch the 2 jumpers with the tip of the screwdriver to complete the circuit due it to all the jumpers in the Front panel block. Sounds kinda like a bad pwr switch.