Z820 fans not running

[Stefferd]

Hi,

I recently bouht a Z820, with dual CPU (E5-2643) and watercooling installed.
Yesterday i tried booting, and i had 4 errors: pump for CPU0 not running, and the 3 fans for CPU0 are also dead. after pressing F1 the system immediately shut down.
After some checking i found out that the pump, and all the fans on the CPU0 side are indeed not running.
They are not broken - i've tested the all. Also the pump.
On further investigation none of the headers provide 12 volts.
The CPU0 still gets warm after powering on, so i hope he's not broken.

I've tried to reset the bios and it was updated to last version before this happened.

Does anyone have an idea what extra steps i can take? Id would be a pitty if it's broken, i just bought it (refurbished) and the only thing i've done with it is intall windows  and run passmark.

Thanks,

Stef

[DGroves]

which headers are the water pumps power lines connected to? you should have 2 power lines one for each cpu  the headers are marked on the board as cpu 0/cpu 1 and are along the top of the motherboard with one at each end of the board

the main fan shroud has a plug that mates to the motherboard, inspect both connectors for damage (board and shroud) if this is damaged or not fully seated fans will not spin/work

[Stefferd]

Hi DGroves,

CPU0 pump is connected to CPU0 header. Board and shroud are all well too - i've checked for damage, it's all fine. 
It was working before, just from one day to another the complete CPU0 cooling part dropped out. And strangely enough, just the CPU0 part.
As mentioned: i've checked the header for voltage, and measure 0 volts on the first two pins (which should have 12 volts on it.)

It actually seems more like a power supply problem.

Regards,

Stef

[Stefferd · Accepted solution]

Ok, so i might not have solved the problem, but i do found some sort of fix for it.
It seems like a powerrail on the mainboard that's gone.
So i have built a 'bypass' taking 12 volts from the harddisk header an fed it to fans and pump, while leavin the other pins from the header where they were - so PWM for fanspeed and feedback from the fans are still in position.
It all seems to work again - fans and pump work again , get regulated and give the mainboard feedback - so no more errors and they speed up when things get hot.
I guess i'll accept that as a solution rather than replacing the mainboard, because it's quite clear some power rail has broken on it.