Solved Failing PSU?

[carwiz]

THAT The Asus snapshot looks good but you can't tell by just one view. You have to determine if they vary by more than +/- 5%. You should monitor the voltages while under a load.

And, you still haven't shown me the voltage area of the sensor window. Scroll down.

 

[PSCO2007]

Here you go ..

 

[PSCO2007]

THAT The Asus snapshot looks good but you can't tell by just one view. You have to determine if they vary by more than +/- 5%. You should monitor the voltages while under a load.

And, you still haven't shown me the voltage area of the sensor window. Scroll down.

You should monitor the voltages while under a load.

I ran Prime95 for about 30 minutes and it said Stable.

 

[carwiz]

Well, those AUX sensors for the Nuvotron 67790 must be undefined in HWiNFO but the voltages look in range.

Looks to me like it all falls back on ASUS and the BIOS since the problem goes away by disabling hot swap. But, I don't know if there are additional options available in the BIOS for controlling hot swap. When all else fails, read the manual.

 

[TVeblen]

It is a problem sometimes that the sensors themselves can be unreliable, either in detecting fault or in reporting OK when it is not. And the software that uses the readings from the sensors adds another layer of uncertainty.

Using a multimeter is the best a home tinkerer can do in diagnosing a power supply. And even that is a crude test. But it is far more accurate than relying on the motherboard's sensors. Accurately testing a power supply requires far more sophisticated equipment than most folks would have at home.

If you can't borrow a multimeter then the next best thing would be to borrow another power supply.

Looking in another direction: It is possible that there is a flaw in the motherboard's logic circuit that is triggering a "power on" event. When the system is OFF but the power supply is still switched on there is standby voltage to the board (and usually a green indicator LED is on). To signal a power-on call all that is needed is that the 2 wires on the Power Switch circuit to close or make contact, even briefly. If there is a flaw in the logic circuit that could trigger your symptom.

The power logic circuit consists of

• The power supply (it will read the call and turn on - if it is short circuiting inside the supply that would do it.)
• The motherboard 20+4 cable or connection
• The motherboard Case input PWR SW block or circuit pathway.
• The Case PWR SW wire.
• The Case Power Switch (which if defective could be making contact on just a vibration from walking on the floor)

You might try an experiment by disconnecting the PWR SW lead from the case from the motherboard for a while. You can start the PC by just touching the 2 leads together with the blade of a screwdriver while testing. This at least would eliminate the switch and wires from the equation.

 

[ICIT2LOL]

Yep you are right TV the grey cable at pin 8 on the 24 pin plug is the Power_Good turn on signal and has to be between 2.4 and 6v outside of those volts the machine will either not turn on / power on.

Pity the OP has no multimeter it would be a simple thing to find out.

 

[ICIT2LOL]

Ok I meant to mention too if you use a meter to diagnose those voltages DO NOT use an analogue meter (one with a needle that swings across the readout face) because it injects a voltage typically 9v into the system for diagnostic purposes and that could end up bricking the board.