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Motherboard turning on and off after 15(ish) seconds

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August 9, 2013 7:09:15 AM

Hi,

Two different Gigabyte motherboards are having the same issue with two different PSUs - one of which I know works fine as it's been used in between trying to get these motherboards to work.

Set up is as follows

Corsair CX430M PSU or Corsair HX620
Gigabyte H77N-Wifi motherboard
Intel G850 CPU

Nothing else is currently plugged in.

Other motherboard is a H61M-D2H-USB3.

CPU and the HX620 have worked perfectly well in P8Z77-M Pro Asus board (with RAM and drives, all the way into Windows or Ubuntu which have both worked fine, even doing a graphics benchmark on the intel gpu)

So I know that the bigger PSU and the CPU are fine.

The H61M motherboard had this issue before -but somehow righted itself.

I have tried...

Re-seating the CPU (three times),
Replacing and re-applying the thermal compound
Resetting the CMOS and removing and replacing the Bios battery

Any help right now would be awesome as I'm getting a bit stressed over what is meant to be a simple system for my mother to watch netflix on and send emails with...

Thanks

Best solution

August 9, 2013 7:40:06 AM
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Well, check whether the main ATX (24 or 20+4) cable is properly connected to Motherboard. Same with the 4 pin/8 pin or whatever cables. Make sure they are connected properly.

If the problem still persists, get your PSU checked. Get a friend to check it in their PC. There's a high probability that your PSU is faulty.
August 9, 2013 8:08:40 AM

Two PSUs being faulty - when one is from a working machine seems unlikely though does it not?

I have tried re-seating the ATX power cable (VERY VERY Tight took ages to wiggle in without forcing it).
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August 9, 2013 8:12:55 AM

I should add, the motherboard doesn't have pins to attach a speaker so no idea if it's trying to beep or not.
August 9, 2013 8:18:52 AM

Doesn't it have like a Debug LEDs?? Check that and refer to your motherboard manual.

Connect a speaker to the plug in the rear, the green one which is near the Motherboard DVI/VGA port and LAN port.
August 9, 2013 8:37:13 AM

update:

The tatty H61 motherboard lives! Hurrah! It needed to repair the bios from a backup. Now while this wont fit into the mITX case I've got, it confirms that a) the motherboard wasn't faulty, b) the PSU lives and c) the CPU is alive

Now to work out how to make the mITX one work...

Edit - nope, no LEDs at all, so no help there, will try plugging in a speaker to the green port
August 9, 2013 8:46:25 AM

Keep 'em updates coming.
August 9, 2013 8:47:46 AM

Don't know what I did... put it back together - and boom I got a bios screen for the first time all day - I'd even forgotten to plug in a speaker... will see what happens when hard drives et al are added back in... cross your fingers
August 9, 2013 8:54:00 AM

Yeah Sure fingers crossed XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
August 9, 2013 10:21:01 AM

Well, mITX bored didn't whinge any more about the BIOS, but wouldn't even turn on with the second stick of RAM...

I was expecting that as it was secondhand and only worked in the Z77 board thanks to it's MemOK function - and even then flashed red lights the first time it booted up...

Windows is installed, drivers are installing as we speak...

Incidentally - the green speaker port did nothing...

My one minute review of the Gigabyte H77N-WIFI is as follows: While an inexpensive and small feature packed board there are NO indicator lights or speaker connectors, so if it doesn't work first time, trial and error is your only hope! Otherwise, built-in WIFI and Dual LAN adapter and ludicrous numbers of USB ports are a great buy.

Now, onto putting the Z77 board to the purpose it was bought for, the 3770k that arrived today!

Thanks for listening!
August 9, 2013 8:58:14 PM

Did you connect the speaker's power cable to the outlet?
!