motherboard not powering up problem.

frontfoot

frontfoot

frontfoot

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31 Jul 2012
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Hi Guys,

wondering if any of you have any ideas on my build problem. I have just received my order from ocuk

After not getting all my water cooling tubing in my initial order, had to wait another day for that to arrive (and never got the games I was told I'd get as part of the order). Then yesterday i found out the PSU was dead (I used the self test button at the back of the PSU and it just clicked, no activity). I ordered another one which arrived today and now I have got past that problem - the PSU self check works.

So after a day of making sure I have no leaks on my water cooling loop I unpack the mobo and start to assemble the PC. After plugging it all I notice that the motherboard has no power. When I plug the 24 pin PSU into the mobo the lights briefly flash on then immediately go out. Unplugging and replugging the cable in has the same effect, lights on mobo flick on then go out. Obviously power switch on PC won't do anything as mobo not getting power.

I have tried plugging in the 8 pin 12V cable into the motherboard as well, that makes no difference. My motherboard also has a 4 pin 12v atx socket but I thought I only needed to use the 8 pin one not both? My mobo is a gigabyte z87x-oc and my PSU is a corsair AX860i.

To try and isolate the problem I have unplugged everything from the mobo except the CPU and water block (since that was a real pain to attach). Plugging the cable in and taking it back out again has the same effect, lights flick on momentarily then go out. Made me think there was a short circuit somewhere so I took the mobo out of the case completely - I saw nothing that could have caused a short circuit. I then put the mobo onto a box and did the same test, plug and unplug the cable, same results, lights flick on then go off.

Does anyone have any more ideas? Do I need to find a way to plug in both the 4 pin and the 8 pin 12v atx sockets on the mobo? Or is the mobo also dead?

Turning out to be a good order so far this one. Missing items, dead PSU and now maybe dead mobo too. And I haven't even tested the RAM, CPU or graphics card yet :(
 
You need the 24pin and either of the 4pin or 8pin (I used the 8pin).

There is a BIOS switch on the board, flip it to the back up..is the result still the same?

Are any off the CPU socket pins bent?

Try a stick of RAM at a time and try each RAM slot in turn?
 
stulid said:
You need the 24pin and either of the 4pin or 8pin (I used the 8pin).

There is a BIOS switch on the board, flip it to the back up..is the result still the same?

Are any off the CPU socket pins bent?

Try a stick of RAM at a time and try each RAM slot in turn?
Click to expand...

Thats what I thought about the 8 or 4 pin plugs - cool so thats ok

CPU Pins looked fine when I dropped the haswell into place and it fitted in nicely, no issues at all. I have not taken it out to recheck, but I doubt thats the issues, one of the smoothest CPU installations I've had. Unlike installing the water block, fingers are cut to shreds now :(

With regards RAM, wouldn't that be a problem when I press the power switch? At the moment I am just trying to get the motherboard LED's to stay lit up? Likewise for the BIOS switch, would that make a difference to the mobo LEDs lighting up (i.e. just plugging in the power cable, not reaching the point of trying to press the on switch on the case at this point in time).
 
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Might be too tight a CPU cooler also,tried a cmos clear,battery out for 10minutes

Flicking to backup BIOS would rule out corrupted main BIOS ect

Does CPU fan spin? Any error code on the led clock
 
wazza300 said:
Might be too tight a CPU cooler also,tried a cmos clear,battery out for 10minutes

Flicking to backup BIOS would rule out corrupted main BIOS ect

Does CPU fan spin? Any error code on the led clock
Click to expand...

No fans spin, I am not trying to turn the PC on - just get power to the mobo

Likewise the led clock flicker on momentarily when I plug the cable in then the LED's go out.

Wouldnt the BIOS issues come into play when I try to power on the PC? I have not reached that point? I am just trying to get the LEDs on the mobo to stay lit when I plug the ATX power cables in.

Too tight a CPU cooler, I can untighten it a bit, would that prevent LEDs from powering up? That is something I can try.
 
Idk if they are meant to tho? Only when you try to powerup/boot pc? Everything should lightup when you press the onboard power button or case front panel power button
 
The only thing (if memory serves me right) that should be illuminated is the onboard power button.

Then when you press it more lights and the debug LED should kick into life.
 
Ah, I thought the "on off" switch (the one with the standby icon on it) on the mobo was meant to stay lit when you plug in power. And most mobo's I have used have had an LED on them to indicate they are getting power even when PC turned off. I'll check manual for that.

When I had everythiing plugged in, when I hit the on/off swith on the case nothing happened, no fans spin, no lLED's light up.
 
stulid said:
The only thing (if memory serves me right) that should be illuminated is the onboard power button.

Then when you press it more lights and the debug LED should kick into life.
Click to expand...

The onboard power button momentarily flickers on when I plug the cable in, it does not stay lit.
 
Would the onboard power button light up if nothing apart from the one 24pin atx cable is plugged into the mobo? I.e. is it worth me unplugging the water block and removing the CPU?
 
Hmm, in the bottom right is a button called CBAT, this is a hard reset of the board (more nasty than removing the battery) press it, then the only way to get the board to work again is to remove the big 24pin plug and then refit (you may have to wait some minutes also).

To get the board to fire up you need the 24pin, 8 or 4pin, CPU and cooler and RAM.
 
Yeah for powering up I'd need to have CPU ram (and gfx I thought). I am just trying to get to the point of having the reset sw on the mobo stay lit up. Unless I am mistaken that should stay lit once the 24 pin cable is plugged in?
 
Dont need the GFX card, the CPU has an inbuilt IGP, the board has a display connector or two on the rear.
 
You have built in graphics inside the CPU,to know for sure is connect all needed power plugs 4 or 8pin and 24pin and one ram module,then powerup the pc,the power button might remain lit on powerdown once the boards been booted for the first time ect,right now the board isn't storing any juice
 
Ah yeah forgot about the IGP on the haswell. I'll go plug in one stick of ram in and try that - see if thats enough to get the reset switch on the mobo to light up.
 
tried one stick of ram, cpu and just the 2 cables (24+ 8 pin atx cables). (EDIT: and the power sw cable from the case is hooked up).

On off switch does nothing, not even a flicker.

Only flicker I get is when I plug in the atx 24 pin cable, the LED debug panel and the reset switch light up for a fraction of a second.

I have reseated the cpu too, all looks fine there, could see no sign of bent pins.
 
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Cry lol, this would mean my 3rd PSU in as many days.

But many thanks, I have an old 600W one I can use to give it a test tomorrow while I send back this 2nd PSU!

I'll lbe so relieved to get this build done, seems like one problem after another and I had absolutely no idea there was a compatibility problem between this board and PSU, not sure I'd ever have found out without your help either! So thanks for that :)
 
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