Originally posted by: iwodo
Becuase my power switch Pin on My motherboard is damage. ( And changing or buy or RMA is not an option for me )
So i found a way to turn on the PSU was by puting a wire in between the Green Wire ( Power ON signal ) in the PSU plug and to a Black wire ( ground ).
Now when i switch on the PSU, My motherboard turn on but the debug card is all red coded. I have had this error before when i installed my GFX card too tight. But now i have fix that and i am still getting this error.
So i am wondering if PSU on is nessary = to PC should boot up.
For the 'PSU=on' to return (- wire) boot, it must also have the right power-good connection (I don't think you can get around this by shorting it to a - wire; this (the power good) detects shorts as well as if the MB is accepting the PSU power. If this (power-good) detection is not accepted, it will act like it's a short(it will start for a second, then shut off ASAP). Remember that PSU-on to -wire short? that is the same thing as pressing the power button(where the motherboard sees this, and pulses that PSU-on cable
once to turn it on. So keeping it shorted is the same as pressing that power button over and over really, really fast. This is what happens for the PSU:
Power on (the PSU starts to turn on)
**ALARM** (the power good wire is not responded to, it thinks there's a short. It turns off, hoping to spare your parts)
It does an emergency off, cutting power (like unplugging it from the wall)
It detects that the PSU-on wire is shorted(like a normal pressing of the power button) and the cycle starts over again.
The net affect of this is that you'll get your fans going at half speed/voltage, because the PSU is only on for about 1/2 the above cycle. You HDDs will not spin (unless they are incredibly cheap ones) becuase they are not getting good power. Your MB will get 1/2 voltage across the lines, and your diagnostic card is going nuts (remember, still running at 1/2 voltage).
Perhaps your power good pin is not getting the right signal from the motherboard. I think they'res some cuircitry between the power button connector on the MB and the PSU-on wire/ This cuircitry is not being activated (your just skipping the MB part ) and the MB isn't running the Power-good routine.