CPU fan won't spin

**aidanw123** · July 10th, 2012, 04:49 PM

Hi people, hope you can help me. I've decided to build my own computer, just got all the parts and everything seems to work except the cpu fan which moves a bit then doesn't spin. I try to boot and just get a load of beeps of my mobo and an error code which in the manual says "Pre-memory North-Bridge initialization is started"
However, when I plug the fan into a normal sys header not the cpu fan header I still get errors but fan works.
Specs:
Motherboard:Gigabyte GA-Z77X-UD5H-WB
CPU:Intel i7 2600K
PSU: Antec HCP 1200 1200w
RAM: Corsair Vengeance

**SoloCamo** · July 10th, 2012, 04:55 PM

Hello and Welcome to TechIMO!

This said, in the title line you mention the CPU fan isn't spinning, but in the message you dont mention it.

If it's indeed not spinning, don't boot the pc with until you can test the fan or swap it out.

Try different ports on the pc (assuming it's a standard 3 pin, try other mobo ports)

Ideally, pull it out and test it by itself on another pc, by running it not attached to anything but a power lead from another computer with a proper running cpu/fan.

**aidanw123** · July 10th, 2012, 05:00 PM

sorry just updated but no it's a 4 pin

**aidanw123** · July 10th, 2012, 05:01 PM

Oh yea and after about 3-4 secs it restarts anyway

**ShyguyXPC** · July 10th, 2012, 05:07 PM

if your running a Dual Channel RAM kit, make sure the sticks are installed in the proper slots, if their in slots 1 and 3 right now, install then in 2 and 4 and try again.

**aidanw123** · July 11th, 2012, 01:16 AM

RAM is installed right next to each other so I think that's fine. It wouldn't be the cpu do you think?

**ShyguyXPC** · July 11th, 2012, 02:58 AM

RAM in most Dual Channel configs Are NOT placed next to each other, unless the board only has 2 RAM Slots, if it has 4, most Dual Stick setups have an empty slot between them.

Quad Slot board: Newegg.com - GIGABYTE GA-Z77X-UD5H-WB LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

reading the manual helps...

ftp://download.gigabyte.ru/manual/mb...77x-ud5h_e.pdf

downloaded from here: GIGABYTE - Motherboard - Socket 1155 - GA-Z77X-UD5H-WB WIFI (rev. 1.0)

Look at attached Screen shot... as said, the sticks need to have at least one slot between them open for a dual stick setup.

**aidanw123** · July 11th, 2012, 08:41 AM

Fixed RAM and still have the same problems.

**ShyguyXPC** · July 11th, 2012, 02:41 PM

ok, at least that has been entirely ruled out, aside from possibility that the RAM itself is defective, but at least its installed in proper slots.

**MD1032** · July 16th, 2012, 03:48 PM

You need to write down the beep codes and find out what they mean for your mobo. The problem could easily be unrelated to the CPU fan itself. You may need to contact Gigabyte for the beep codes but IME they're out there if you google hard enough.

They are usually in the format SHORT-SHORT-LONG or something like that. It is analogous to a check engine light on your car...your mobo has diagnosed a problem and is trying to tell you something...start there. There may be multiple codes, too.