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Computer not starting up after upgrading cpu, motherboard and ram.

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July 3, 2013 6:01:38 PM

I recently upgraded my motherboard to the Gigabyte GA-Z77X-UD3H. I bought 8 gigs of DDR3 ram, put it in. I then put my already owned GTX 460 v2 in the motherboard. It started fine, but after a few hours, I turn off the system and it won't come back on. The motherboard light is coming on, but when I press the power button, the gpu fans spin for about half a second but the cpu doesn't start D:
Appreciate any advice u guys have.
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a b V Motherboard
July 3, 2013 6:03:50 PM

Can you list the full specs of your build?
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July 3, 2013 6:08:58 PM

realchaos said:
Can you list the full specs of your build?


Motherboard: Gigabyte GA-Z77X-UD3H
GPU: Geforce GTX 460 superclocked edition
Ram: 2x 4-DDR3 Corsair
PSU: Omega ATX Power Supply 750W
not sure about hard drive is it necessary?
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July 3, 2013 6:09:23 PM

Hey man. I recently had a similar issue with my rig after upgrading with new i7 and msi z77 board. For me, doing a reset of the bios fixed a non boot issue. You should double check all your connections for power / hdd data cables etc. Also try removing and reseating the ram. If you don't find anything loose / doesn't fix the problem, try resetting the cmos with jumper or removing the battery. Make sure the power supply is off or unplugged before resetting the cmos. One last thing that reminds me happened to me before as well. Double check your power supply power cable from the outlet (120v). I had it happen once the plug into the back of the power supply wasn't firmly seated all the way in and I had the same issue your having.
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July 3, 2013 6:12:54 PM

Totalslaughter said:
Hey man. I recently had a similar issue with my rig after upgrading with new i7 and msi z77 board. For me, doing a reset of the bios fixed a non boot issue. You should double check all your connections for power / hdd data cables etc. Also try removing and reseating the ram. If you don't find anything loose / doesn't fix the problem, try resetting the cmos with jumper or removing the battery. Make sure the power supply is off or unplugged before resetting the cmos. One last thing that reminds me happened to me before as well. Double check your power supply power cable from the outlet (120v). I had it happen once the plug into the back of the power supply wasn't firmly seated all the way in and I had the same issue your having.


I reseated the RAM, battery, checked and double checked the Front Panel cables, resetted CMOS, power supply cable is fully pushed in. I tried with one stick of ram, didn't change anything. I should mention that the motherboard has a slot for a 8 pin atx 12v cpu power cable, but I only have a 4 pin that came with the psu. Would that affect anything?
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a b V Motherboard
July 3, 2013 6:13:41 PM

That psu is low quality, so that may be a possibility.
Try using one stick of RAM at a time and see if that fixes the issue.

EDIT: Okay, that's the problem. It has an 8pin cpu power socket for a reason. The processor needs more power than what you had before so you'll need a single 8pin cpu connector or a 2 4pin cpu connector. If the psu doesn't have any of those, you'll have to buy a new one.
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July 3, 2013 6:17:06 PM

realchaos said:
That psu is low quality, so that may be a possibility.
Try using one stick of RAM at a time and see if that fixes the issue.

EDIT: Okay, that's the problem. It has an 8pin cpu power socket for a reason. The processor needs more power than what you had before so you'll need a single 8pin cpu connector or a 2 4pin cpu connector. If the psu doesn't have any of those, you'll have to buy a new one.


I heard that I could use something called a molex to 8-pin converter? Is that reliable?
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Best solution

July 3, 2013 6:20:44 PM

I would say your best bet is to get a new PSU with the proper power connector for the MB. The lack of the 8 pin on the current PSU you have just shows it is for lower power or older MB. Most all newer PSU's will have both a 4 and 8 or a 8 splittable. Will help ensure your rig runs well with whatever new gpu you end up with.


***Update***
Seems i misread your PSU watts or something earlier. Sorry.

You need a 4pin MB to 8pin MB adapter like the one here.

http://www.xoxide.com/tt-psu-adaptor-cables.html

I wouldn't want to power 8 pin MB connector with molex, not sure how well that would work out.
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July 3, 2013 6:23:19 PM

So that's why it was only a hundred dollars...
But why did it power the parts for a few hours before it stopped supporting them? Shouldn't it have not powered the parts in the first place?

EDIT: My local shops don't sell that adapter, but can a molex converter carry 12 volts?
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July 3, 2013 6:32:01 PM

Instead of getting a 4pin to 8pin, I would just get a new psu. Omega psus aren't known for their quality, and you want a quality psu before it blows up on you.
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July 3, 2013 6:33:29 PM

That PSU may be fine for you for many years or it may crap out within one year, but the same can be said for more expensive power supplies as well. Since a PSU is such an important part of a build and I like to OC I usually spend for a known good quality brand.

Basically it's two sets of 4.

4 pin is 2 ground 2 12v
8 pin is 4 ground 4 12v

It just happened to be able to boot up with just 4 but then noticed it was missing half it's grounds and 12vs or whatever and prevented itself from starting after it took note to help prevent any damage.

All the connector / adapter I linked does is split the 4 pins to the 8 pins. Technically you could build your own splitter and do the same thing but your better off buying a premade one so it fits snug and is reliable.
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July 3, 2013 6:36:16 PM

If it were me and I could still return the one you already have and could afford to spend a little more for a better quality I would. Otherwise the adapter would work if you really don't want to return the one you have or spend more, it's just not as clean and it's one more component in there etc and as mentioned the Omega PSU doesn't look to be all that great.

realchaos said:
Instead of getting a 4pin to 8pin, I would just get a new psu. Omega psus aren't known for their quality, and you want a quality psu before it blows up on you.

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July 3, 2013 6:40:14 PM

I'm gonna check my front panel and maybe scrap and reseat everything and report back when i get the chance. If it still doesn't turn back on I'll have to take ur advice and save up for a good PSU.
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a b V Motherboard
July 3, 2013 6:56:54 PM

I would still recommend a new psu regardless if it works or not. A bad quality psu will blow up eventually.
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July 4, 2013 9:52:26 AM

Okay so I turned the computer on and the fans for the hard drive, gpu, and power supply were all spinning. This wasn't happening berfore. The CPU fan still not working though. Since the psu can power those things, how do i get the cpu to work?
EDIT: yeah its a cheap PSU but any other reasons why the cpu fan won't spin when all the other fans would?
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July 4, 2013 11:45:06 AM

Okay, I fixed it by connecting the CPU fan cable to another port on the motherboard ( a SYS_FAN) port. Thank you for assistance :) 
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