Motherboard switch not working

[scd1997]

My motherboard wont start up when I turn it on. It doesn't even lit up when I turn on the PSU button so it means it is not getting any power, right? I tried jumpstarting the switch on the motherboard with screw driver but nothing happens. However, using a paperclip to connect the green and the black wire on the 24 pin power cable while it is connected turns on everything. My pc even boots but when i remove it everything shuts off. I am not sure if the power supply cable is the problem or just a faulty motherboard cable slots. Any alternative ways to fix this aside from hotwiring it?

 

[DRagor]

That's a motherboard fault. I would not advise using this paperclip trick to run the PC in long term. Proper way to solve it would be to exchange motherboard.

 

[ko888]

If the +5Vsb LED on the motherboard isn't being lit when the PSU's AC power switch is turned on then the PSU's +5Vsb circuit is dead. The motherboard needs the power from the +5Vsb circuit to be able to tell the PSU to turn on its main rails (i.e. +3.3V, +5V and +12V).

Try testing with a properly working PSU.

PS. The paperclip test does not require that the +5Vsb circuit be working so it is not an ideal test.

 

[scd1997]

That's a motherboard fault. I would not advise using this paperclip trick to run the PC in long term. Proper way to solve it would be to exchange motherboard.

My motherboard is new tho. Im thinking it is the power supply. Tho my power supply still works in my old rig.

 

[DRagor]

That's a motherboard fault. I would not advise using this paperclip trick to run the PC in long term. Proper way to solve it would be to exchange motherboard.

My motherboard is new tho. Im thinking it is the power supply. Tho my power supply still works in my old rig.

So if it works with the other machine how it could be faulty?

 

[scd1997]

If the +5Vsb LED on the motherboard isn't being lit when the PSU's AC power switch is turned on then the PSU's +5Vsb circuit is dead. The motherboard needs the power from the +5Vsb circuit to be able to tell the PSU to turn on its main rails (i.e. +3.3V, +5V and +12V).

Try testing with a properly working PSU.

PS. The paperclip test does not require that the +5Vsb circuit be working so it is not an ideal test.

The PSU i have now works on my old rig and it lights up the motherboard on that one. But im not sure if the led of that motherboard is meant for the +5Vsb. Im new to pc building so I really dont know anything about this + 5Vsb stuff.

 

[scd1997]

That's a motherboard fault. I would not advise using this paperclip trick to run the PC in long term. Proper way to solve it would be to exchange motherboard.

My motherboard is new tho. Im thinking it is the power supply. Tho my power supply still works in my old rig.

So if it works with the other machine how it could be faulty?

Im not really sure but the PSU is super old. It was bought in 2010. It is a miracle it still works.

 

[DRagor]

Tech didn't change that much since 2010. If it works with old motherboard, it should be able to power new one too. It could have some problems with C-states if it is not compatible with that tech, but it would still power up.

 

[ko888]

If the +5Vsb LED on the motherboard isn't being lit when the PSU's AC power switch is turned on then the PSU's +5Vsb circuit is dead. The motherboard needs the power from the +5Vsb circuit to be able to tell the PSU to turn on its main rails (i.e. +3.3V, +5V and +12V).

Try testing with a properly working PSU.

PS. The paperclip test does not require that the +5Vsb circuit be working so it is not an ideal test.

The PSU i have now works on my old rig and it lights up the motherboard on that one. But im not sure if the led of that motherboard is meant for the +5Vsb. Im new to pc building so I really dont know anything about this + 5Vsb stuff.

It is the motherboard that tells the PSU to turn on its main rails.

For the motherboard to be able to do that it requires that the motherboard be receiving power from the +5Vsb (i.e. +5 Volt standby) circuit of the PSU. The +5Vsb circuit is actually a separate low power +5 Volt power supply in the PSU that is always on when the PSU's AC power switch is turned on.

All of the motherboards that I have ever worked on have a +5Vsb indicator LED of some sort, be it a separate LED or inside a motherboard's SMD (Surface Mount Device) power switch, to tell the user that the motherboard is receiving standby power. +5Vsb powers the circuitry that sends the PS_ON# or Power on signal from the motherboard to the power supply to turn on the main rails.