gigabyte 78 lmt usb 3 2*4 pin 12v power connector issue. system does not start.

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Suman Hassan

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Jun 19, 2015
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I am building a new pc and I have gigabyte ga 78 lmt usb3 mobo and amd fx4300 processor. My motherboard has 2*4 pin 12v power connector, but my psu has only one 4 pin power connector. I have tried to boot up system by connecting it but it did not start. Is it mandatory to connect both 4 pins ?? Please help.
 
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No, one 4-pin should be enough unless you've got a really high-power CPU or you're overclocking it hard. Double-check your connections. I once plugged the 4-pin part of a 4+2 PCIe into the ATX12V 4-pin and it didn't start... (The PSU protected itself by shutting down on detecting the short so I didn't do any damage.)
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norsestar

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Apr 8, 2014
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No, one 4-pin should be enough unless you've got a really high-power CPU or you're overclocking it hard. Double-check your connections. I once plugged the 4-pin part of a 4+2 PCIe into the ATX12V 4-pin and it didn't start... (The PSU protected itself by shutting down on detecting the short so I didn't do any damage.)
 
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Suman Hassan

Reputable
Jun 19, 2015
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4,510
Anyways, i have bought a new corsair psu today as the old one from my old rig did not feel reliable. Now i am having issues with the front panel connector. They do not work. I connected the switches, it booted up perfectly only once when i wrongly connected the reset switch to power connector. System booted when i pressed the reset switch instead of the power switch. Now when i connected them correctly, the system does not start. I have tried all possible combinations, but it did not work. Shorting the power pins with screwdriver also does not work. Any suggestions?
 
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norsestar

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Apr 8, 2014
339
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Is the motherboard in the case or out? I'd start with it out of the case with just mobo/CPU/fan/RAM/PSU and try the screwdriver on the power pins like that. Are you sure you touched the right pins? I remember at least one motherboard with the Power LED pins labeled "PWR" and the Power Button pins "PWR BT" so it can be confusing.
 
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Suman Hassan

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Jun 19, 2015
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4,510
I have managed to start it successfully. i disconnected all the connectors, and connected them one at a time and tested. It started with no hassle once the right connection was made. Thanks a lot for your help buddy.
 
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