Pc powers on for about 5 seconds. Gives up, tries again..

Defy Belief · 29 Nov 2013 at 17:07

Just installed a h100 into my rig cause I fancied a change to my antec liquid cooler. Change over was fine, simple install been doing building for a while now.

Go to power it on, it all runs and lights up, doesn't post and just switches off. Tried another psu, same problem.

Tried without gpu, same problem.

Took off the cooler to see if the CPU gets warm which it does so power is getting to it.

I'm thinking motherboard?

tried with one stick of ram etc also no different.

Perfect timing!!

Digitalle · 29 Nov 2013 at 17:09

Do you have a something plugged into the cpu fan header on the motherboard?

Sliver · 29 Nov 2013 at 17:12

Digitalle said:
Do you have a something plugged into the cpu fan header on the motherboard?

+1

If not then this is why. Your motherboard needs to know there is a cooler on the CPU or it won't boot into OS.

Digitalle · 29 Nov 2013 at 17:17

I say 'something' because on the H100i there is a 'dummy' 3-pin connector that runs off the molex power cable that plugs into this cpu header to allow the motherboard to boot. I'm not sure if this is the same with the previous model.

Defy Belief · 29 Nov 2013 at 17:20

Yep it's plugged in, tried it in another slot and just a fan in the CPU fan slot and still same problem.

Digitalle · 29 Nov 2013 at 17:26

So everything was working fine, you removed the antec cooler, installed the H100 and now it wont start?

Defy Belief · 29 Nov 2013 at 17:30

Yep that's all I've changed. The h100 was working fine in my htpc too, if it ain't broke don't fix it comes to mind oops.

Unicorn · 29 Nov 2013 at 17:35

can you get into bios to disable the cpu header fan? I had to on mine with the h100 so i cant read pump speed now

soundb0y · 29 Nov 2013 at 17:36

I had a similar problem a while ago and fixed it by moving the gpu to a different slot. Don't know if it will work for you.

Defy Belief · 29 Nov 2013 at 17:41

No it doesn't even post, just shuts off, tries again and again until I turn it off.

Swapping gpu slot didn't work, neither does no gpu. Can hear the pump working on the h100 etc all fans spinning.

Unicorn · 29 Nov 2013 at 17:51

Pull the battery, pull the power lead and press the power button few times to discharge any remaining energy. this resets your bios. If you have an overclock u may wana save the settings first. (on a usb or write em down)

Defy Belief · 29 Nov 2013 at 18:02

Didn't work. The plot thickens. I try the intel stock cooler and it boots, so my motherboard clearly dislikes something about the cooler. It's an msi z77a-gd65

Hakanese · 29 Nov 2013 at 18:04

Recheck your psu connectors to your mobo. Could just be a dodgy connection.

Defy Belief · 29 Nov 2013 at 18:42

Now it won't work with the intel cooler, hmph!!

Tried other ram still nothing, noticed the bios has a code of 55 when trying to boot which could mean memory but it clearly isn't my ram. PITA!

Defy Belief · 2 Dec 2013 at 18:56

Update

Bought a new mobo, same problem, it doesn't try to boot repeatedly the fans just stay spinning on the gpu and what's connected to my fan controller, the fans connected to the motherboard don't work? so confused it's really annoying me now.

I can only think it's the CPU now but always thought they were so rare to fail.

Defy Belief · 2 Dec 2013 at 19:57

Update guess who forgot to clear the CMOS on the new mobo? She lives.