Strange PSU prob

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Hi all,
This is strange when I push my on/off button I get no power at all, there is a light on the motherboard.
So I then turn off the off the switch on the PSU and leave it for about 20 secs and then turn back on and push the power on/off button and it boots up fine and runs ok.
But when I then log off and power down if I try to go straight back or wait a while nothing happens and I have to go through the same procedure again (as above).
This is a new motherboard (ASUS A8V Deluxe) and CPU (AMD 3500 939 64bit).
PSU is an 450.

Any help would be great

Thanks
 
Check the small wires from the frontpanel of the case to the motherboard. They are probably not connected properly. Did you connect the square P4-powercable from the PSU to the mobo?
 
Hi mate,
Yes the P4 square cable is plugged in and I have checked the switch cable and seems ok. (But will check again) Would this problem happen if the switch cable was the wrong way round ? It was working ok until I changed my Motherboard and CPU.
 
I tried another PSU I had in an older PC and it works fine so it looks like I have to go and buy a new one.

Thanks for the help :(
 
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