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HELP! PC starts up w/o the ATX_12V.

FrankOcean_
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The system fan and cpu fan starts up normally for around 10 seconds with the psu's cpu cable plugged in into the mobo's 4pin atx 12v pin but it shuts down immediately with a weird noise. My GPU is also weird. It has a PCI-Express pin but doesn't need it to start. It feels like I did everything wrong.

 

specs:

i3-8100

8GB DDR4 RAM

ASRock 4GB DDR5 RX 570

GIGABYTE H310M-A

480GB SSD + 1TB HDD

EVGA 500W BR 80+Bronze

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https://linustechtips.com/topic/1099700-help-pc-starts-up-wo-the-atx_12v/
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Is you PSU modular? The CPU and PCIe cables may be swapped the wrong way around. I believe the pinout is different and would cause the protection circuit to trip.

Black Knight-

Ryzen 5 5600, GIGABYTE B550M DS3H, 16Gb Corsair Vengeance LPX 3000mhz, Asrock RX 6800 XT Phantom Gaming,

Seasonic Focus GM 750, Samsung EVO 860 EVO SSD M.2, Intel 660p Series M.2 2280 1TB PCIe NVMe, Linux Mint 20.2 Cinnamon

 

Daughter's Rig;

MSI B450 A Pro, Ryzen 5 3600x, 16GB Corsair Vengeance LPX 3000mhz, Silicon Power A55 512GB SSD, Gigabyte RX 5700 Gaming OC, Corsair CX430

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5 hours ago, asand1 said:

Is you PSU modular? The CPU and PCIe cables may be swapped the wrong way around. I believe the pinout is different and would cause the protection circuit to trip.

No, my psu's non-modular. It's new as well, so I don't believe that's the problem...

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Can we get a pic of the cables plugged in?

Black Knight-

Ryzen 5 5600, GIGABYTE B550M DS3H, 16Gb Corsair Vengeance LPX 3000mhz, Asrock RX 6800 XT Phantom Gaming,

Seasonic Focus GM 750, Samsung EVO 860 EVO SSD M.2, Intel 660p Series M.2 2280 1TB PCIe NVMe, Linux Mint 20.2 Cinnamon

 

Daughter's Rig;

MSI B450 A Pro, Ryzen 5 3600x, 16GB Corsair Vengeance LPX 3000mhz, Silicon Power A55 512GB SSD, Gigabyte RX 5700 Gaming OC, Corsair CX430

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9 hours ago, FrankOcean_ said:

but it shuts down immediately with a weird noise.

I'm by no means a PSU expert but it sounds like you didn't set your PSU's AC voltage correctly. 

 

Check if your PSU has an AC voltage selector switch at the back. For North America the correct setting would be 115V, whereas European and Asian countries use 230V.

 

Hope it helps. 

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21 minutes ago, Man said:

I'm by no means a PSU expert but it sounds like you didn't set your PSU's AC voltage correctly. 

 

Check if your PSU has an AC voltage selector switch at the back. For North America the correct setting would be 115V, whereas European and Asian countries use 230V.

 

Hope it helps. 

 

I have a 100v and a 240v option. 100v is like the off switch of the psu. 240v is the only option that works. thanks for the reply.

 

1 hour ago, asand1 said:

Can we get a pic of the cables plugged in?

yee

IMG_20190831_020728.jpg

IMG_20190831_020844.jpg

IMG_20190831_020905.jpg

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I see. 

 

I think your PSU automatically switches between AC voltages. The button you're referring to is just an on/off switch, not an AC voltage selector switch. 

 

In any case,  you may want to jump start the PSU with a paperclip and see if it remains on for longer than 10s. And if it indeed does and doesn't make any strange noises then there might be a problem with your mobo or other components. 

 

You can also check its DC voltages with a multimeter, which is much simpler than it sounds. Let me know if you need any help in this regard. 

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Looks like the ATX -12 plu might be turned 90* in the socket. Is the clip lined up with the catch?

Black Knight-

Ryzen 5 5600, GIGABYTE B550M DS3H, 16Gb Corsair Vengeance LPX 3000mhz, Asrock RX 6800 XT Phantom Gaming,

Seasonic Focus GM 750, Samsung EVO 860 EVO SSD M.2, Intel 660p Series M.2 2280 1TB PCIe NVMe, Linux Mint 20.2 Cinnamon

 

Daughter's Rig;

MSI B450 A Pro, Ryzen 5 3600x, 16GB Corsair Vengeance LPX 3000mhz, Silicon Power A55 512GB SSD, Gigabyte RX 5700 Gaming OC, Corsair CX430

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1 hour ago, Man said:

I see. 

 

I think your PSU automatically switches between AC voltages. The button you're referring to is just an on/off switch, not an AC voltage selector switch. 

 

In any case,  you may want to jump start the PSU with a paperclip and see if it remains on for longer than 10s. And if it indeed does and doesn't make any strange noises then there might be a problem with your mobo or other components. 

 

You can also check its DC voltages with a multimeter, which is much simpler than it sounds. Let me know if you need any help in this regard. 

When the ATX_12v pin isn't connected, everything works perfectly. No shut down or anything.

 

8 minutes ago, asand1 said:

Looks like the ATX -12 plu might be turned 90* in the socket. Is the clip lined up with the catch?

Yeah, it's plenty wack. I talked to my cousin who built his own pc, told me to get a new psu or a mobo so I can connect all 8 pins.

 

8 minutes ago, XHT_001 said:

put a screw in every board mounting hole to ground it fully, if it isn't grounded, you end up with all that and a PCH debug code

All screws and standoff are fit in snugly. I, like, took everything out and put it back in at least 4 times already.

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It's hard to see in there but it really looks like your plug needs to be turned 90* to the left. The catch on the socket is at the top and thats where the latch on the plug should be.

Black Knight-

Ryzen 5 5600, GIGABYTE B550M DS3H, 16Gb Corsair Vengeance LPX 3000mhz, Asrock RX 6800 XT Phantom Gaming,

Seasonic Focus GM 750, Samsung EVO 860 EVO SSD M.2, Intel 660p Series M.2 2280 1TB PCIe NVMe, Linux Mint 20.2 Cinnamon

 

Daughter's Rig;

MSI B450 A Pro, Ryzen 5 3600x, 16GB Corsair Vengeance LPX 3000mhz, Silicon Power A55 512GB SSD, Gigabyte RX 5700 Gaming OC, Corsair CX430

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59 minutes ago, FrankOcean_ said:

When the ATX_12v pin isn't connected, everything works perfectly. No shut down or anything.

 

Yeah, it's plenty wack. I talked to my cousin who built his own pc, told me to get a new psu or a mobo so I can connect all 8 pins.

 

All screws and standoff are fit in snugly. I, like, took everything out and put it back in at least 4 times already.

check front panel plugs and fans for any left over spare pin showing

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Read the manual for your motherboard... if its like mine, it says to only connect EITHER the 12v area or the 24 pin area. Not both. If that is the case, this sounds like its working as intended.

My old computer does have both areas connected though, but I am not sure that small area is a 12v area for that motherboard and its not the same amount of pins.

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7 hours ago, asand1 said:

It's hard to see in there but it really looks like your plug needs to be turned 90* to the left. The catch on the socket is at the top and thats where the latch on the plug should be.

 

That part I know is connected successfully, since I always hear a click when I put it in perfectly. When the latch is facing a different way, it either doesn't click or get put in at all.

 

2 hours ago, Caldor said:

Read the manual for your motherboard... if its like mine, it says to only connect EITHER the 12v area or the 24 pin area. Not both. If that is the case, this sounds like its working as intended.

My old computer does have both areas connected though, but I am not sure that small area is a 12v area for that motherboard and its not the same amount of pins.

 

It says the 12v mainly supplies power to the CPU. If the 12V power connector is not connected,the computer will not start. Seens the opposite to me, though. :/

 

1 hour ago, Caldor said:

Read the manual for your motherboard... if its like mine, it says to only connect EITHER the 12v area or the 24 pin area. Not both. If that is the case, this sounds like its working as intended.

My old computer does have both areas connected though, but I am not sure that small area is a 12v area for that motherboard and its not the same amount of pins.

The 24pin is necessary, since I think it sends power to all the other parts. The 12v pin is... confusing. It doesn't look like I need it, to be honest, but I've read all across the internet that the CPU doesn't work without that plugged in. That was the reason for this thread being created in the first place.

 

 

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