Computer turns on for split second then 'turns off".

GadeEmbossed · Apr 9, 2017

My new build will only turn on for a split second then turns off. The cpu fans are not factory they are Alpine 20 Plus. The fans are connected by molex and when it "turns off" the fans stop turning and nothing has power but the motherboard still has the light on for the Ethernet jack. Sot it doesnt actually turn off there is just no power to to certain parts. I am using two Xeon e5 2660 CPUs. I tried turning it on with one CPU and with only one ram stick in every slot. There is no video either which I am using a GTX 1050 TI OC which works in a different computer. The motherboard has no integrated graphics. The motherboard is from a Dell Precision T5600. The power supply is KDM Brand 875 watts and was tested in a different computer and works. I even checked the standoffs. I also tried turning it on with a screwdriver using the power pins. I tried powering it on without the hard drive or fans (except for cpu fan). Please help.

Is it the fans not being connected to the motherboard? If so how can I bypass this without buying the correct fans that fit in the fan plugs?

Is KDM 875w power supply bad and only is outputting less wattage?

Paul NZ · Apr 9, 2017

Did you connect the ATX12v connector if it's got one? Check the pins see if any are bent

GadeEmbossed · Apr 9, 2017

Paul NZ :

I have the 12v power connections connected, I have checked the pins and they seem fine.

Paul NZ · Apr 9, 2017

Is the mobo new or used?

GadeEmbossed · Apr 9, 2017

Paul NZ :

It was refurbished

Paul NZ · Apr 9, 2017

Did you see it going before you purchased it??

GadeEmbossed · Apr 9, 2017

Paul NZ :

No it was off ebay from this seller: http://stores.ebay.com/AltaTech?_trksid=p2056016.l2563

Paul NZ · Apr 9, 2017

If it has a battery try replacing it. It maybe dead.

GadeEmbossed · Apr 9, 2017

Paul NZ :

Thanks but I have already tried that

Paul NZ · Apr 9, 2017

When you said the fans are connected by molex do you mean the cpu fans?

If you do, I would connect them to the cpu headers. It looks like theyre 5 pin not 4 pin tho

GadeEmbossed · Apr 9, 2017

Paul NZ :

Yes the cpu fans are connected by molex, and yes the motherboard has 5 pin connectors which I tried to fit in but wouldn't

Paul NZ · Apr 10, 2017

Could be why it stops. It detecting that theyre not connected to the headers

GadeEmbossed · Apr 10, 2017

Paul NZ :

How could I fix this, could I trim the 4 pin fan connector down until it fits?

Paul NZ · Apr 10, 2017

Can you take a pic of the inside of the case / the fans and the 4 pin connector on the cpu fans??

And post them on a site like Imgur.

I think the fan connectors can only go one way

GadeEmbossed · Apr 10, 2017

Paul NZ :

I am using the Arctic Alpine 20 Plus but here is a similar one with the same colors:
http://nix-omsk.ru/graber/imgs/nix/10/95794/0.jpg

Here is the motherboard fan connection:
http://i.ebayimg.com/images/g/taMAAOSw9GhYZW-8/s-l1600.jpg

Here is the cooler that is 'ment' for it:
http://www.jecomponents.com/img/g4t9t..JPG

Paul NZ · Apr 10, 2017

Only other thing you can do is get a needle and take / pull the wires out of that Artic cooler and buy a connector that fits the headers

And connect the wires like this

Or cut down the middle of the 4 pin on the Artic cooler. So you get 4 separate wires

GadeEmbossed · Apr 10, 2017

Paul NZ :

Ok, would this safety feature stop the computer like this? (turn off right after it turns on but still have 5vSB)

Paul NZ · Apr 10, 2017

Or pull the wires off the original cpu fan connector, put it on one of the artic fans. See what happens

Well most computers have to have the cpu fan connected to the cpu header.

Having it on a molex may make the fan spin but the system wouldnt know that

I think this is the kind of plug you need for the end of the fans

I would take the mobo into a pc shop and see if you can get a plug that fits the cpu fan header first then go from there

GadeEmbossed · Apr 10, 2017

Paul NZ :

Do you think it could be the problem with the case fans aswell if this doesnt work? Or would it just give a warning on the boot

GadeEmbossed · Apr 10, 2017

Paul NZ :

I am going to try the cutting the 4 pin fan connector into individual wires and let you know if it is solved

Paul NZ · Apr 10, 2017

Computer turns on for split second then 'turns off".

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