Need help with a build

CoryAlan · May 9, 2014

Hi guys, first time here. I built a new gaming rig for my friend Dylan today and ran into some issues. In order to connect the rear 120mm fan. I had to use a molex to 3-pin fan connector. For some reason the comp would not post with this fan connected. But when I disconnect the fan, the PC posts fine and works with no problems. Trying to troubleshoot this problem with my fellow builder Taylor. The molex to 3-pin connector started smoking and melted. Not of the other components were damaged. Taylor thinks that the 750watt PSU couldn't handle 5 system fans, But I swear that it's fine. We ended up disconnecting the fan all together and the PC works fine, windows installed and all. This PSU is more then Dylan needs for to run all these parts right?

I ordered the following parts:

Noctua NH-D14 CPU Cooler

Kingston 8G(2x4G) DDR3 1600MHz CL9 HyperX

Seagate SATA3 2TB 7200RPM Barracuda
Zalman Z11-Plus Black ATX Gaming Case

Kingston SSDnow SV300S37A/120G 120G

Intel Core i7 4770 LGA1150 CPU 3.4Ghz 8Mb Cache Haswell

eVGA GTX760 4G FTW with ACX

Gigabyte G1-SNIPER-B5/B85/4 x DDR3/4 x PCI-E/2 x PCI/4 x SATA3/4 x USB3/HDMI/GBLAN/ATX

SeaSonic G-750W 80Plus Gold Semi Modular PSU

Please help me with this problem.

Oshino Shinobu · May 9, 2014

That PSU is way more than enough to run everything. Are there no places on the motherboard where you could plug the fan in? Maybe try a 3 pin extension.

Sauron · May 9, 2014

I think either the connector was defective, or the fan was. Have you tried running the same fan on another computer or simply with another connector? And yes, the psu is almost overkill with this build, it shouldn't give you any problem whatsoever. In fact I run a similarly power hungry system on a 500w psu and i never had any issues.

ross06187 · May 9, 2014

its sounds like the fan was bad. shorted to some extent. therefore the board would not post, but the PSU will give it allot more power.

CoryAlan · May 10, 2014

Thanks for the help guys. The motherboard I chose only had 4 fan headers. I for the CPU where I had to use a Y cable for the two Notcua fans on the CPU Cooler. Two headers for the Top and Front 120mm LED Fans. I used a Molex splitter cable for the two 80mm side fans that are powered by the PSU.

But it's the rear fan that had the fault. Since it was a molex plug, I had to use a molex to 3-pin connector to plug it into the remaining fan header.

His system doesn't really need the rear fan seeing as the GPU and PSU are exhausting the hot air.