Pc wont boot but power led lights up

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hall_1

Commendable
Jan 13, 2017
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So i just recieved my new nzxt s340 in the mail and switched it out for the case my prebuilt pc came in but as i finished and went to turn it on the only thing to happen was the power led lights up. Nothing else responds and i suspect the culprit to be a cable that says do not connect while pc is powered on. I left it unplugged assuming it could hurt my pc and am afraid if i plug it in then turn my pc on it will mess something up even more. Some help would be appreciated
Radeon r9 380 4gb
1TB HDD
Fx 6300 cpu
700 watt psu
16 gb ram
GA78lmtusb3 mobo
 
Solution
Karadjgne
The s340 to my knowledge doesn't use a molex for the fans. The fans should be hooked directly to the motherboard. Case fans have absolutely nothing to do with a pc starting up or not, it's a totally separate operation, so there is something not right with the way you have things hooked up or that molex you refer to isn't actually a molex. The common usage of a molex connector is a inch wide 4 pins in a line connector with one long side with shaved corners coming directly from the psu. Normally there's 2-3 on the same cable. These are auxiliary power connections for fans and other add in components that have nothing to do with pc operation, but are additional too. If the fans are smoking, that's usually indicative of being fed the wrong...
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hall_1

Commendable
Jan 13, 2017
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1,510
Ok so i looked into it and discovered the cable a was rightfully warry about is called molex and when i plugged it in (to power my fan) the rig turned on but the fans instantly let out a foul smelling smoke that filled my room so i turned it off. At this point i have no clue what to do please help
 
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Karadjgne

Karadjgne

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Dec 26, 2012
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You need:
20+4 power connector seated right side of the board.
4+4 or 8pin EPS connector seated left top of the board.
Cpu seated correctly, with no bent pins and cpu fan installed to the cpu_fan header.
Ram seated all the way.
All the front panel connectors on the correct pins as per your manual, don't get polarity backwards or assume old configurations. This includes the speaker.

That'll get you minimum to post, should hear a beep. If no beep, double check that all your connections are fully seated, many times new boards are very stiff and pins don't seat. Make sure no wires are backed out of their connectors.

Anything else is not necessary.

If you get a beep, then hook up the hdd/ssd, gpu, optical, monitor etc finishing build.

As to what connector that you say don't hook up while pc is on, that's pretty much every connector but you'll have to give a better description. As in what it's attached to, what it looks like etc. Better yet, a picture. You'll need to use imgur or postimg.org etc for that.
 
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hall_1

Commendable
Jan 13, 2017
4
0
1,510
After attempting that solution im still getting same response, no beep just power light and if i attach the molex for my fans it starts smoking from the fans and smells like gas
 
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Karadjgne

Karadjgne

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Dec 26, 2012
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The s340 to my knowledge doesn't use a molex for the fans. The fans should be hooked directly to the motherboard. Case fans have absolutely nothing to do with a pc starting up or not, it's a totally separate operation, so there is something not right with the way you have things hooked up or that molex you refer to isn't actually a molex. The common usage of a molex connector is a inch wide 4 pins in a line connector with one long side with shaved corners coming directly from the psu. Normally there's 2-3 on the same cable. These are auxiliary power connections for fans and other add in components that have nothing to do with pc operation, but are additional too. If the fans are smoking, that's usually indicative of being fed the wrong voltage down the ground wire


Your old system was a pre-built. Often times that means proprietary connectors are used. The new case is aftermarket so any connectors it uses are universal to aftermarket parts but not to proprietary parts. There's nothing I know of that's inside the s340 that requires a molex connector.
 
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