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Weird PSU problem

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June 1, 2013 10:46:07 AM

Hi guys, I'm having a problem getting my computer to boot with a 650w EVGA Supernova power supply. It works fine with a 400w Dynex I bought to test out. I thought that meant that the EVGA was bad, so I RMA'd it. The new one they sent has the exact same problem. I plugged in a power supply tester and it says the EVGA is fine.

The issue is that the fans and leds come on for an instant and it immediately shuts off.

Could there be an issue with this particular power supply/motherboard combo?

Components:
CPU Intel Core i7-3770K
Motherboard Gigabyte GA-Z77X-UP5 TH
Memory Corsair Vengeance 32GB (4 x 8GB) DDR3-1866
Storage Sandisk Extreme 240GB SSD
Case Thermaltake Soprano
Power Supply EVGA Supernova 650W ATX12V / EPS12V

More about : weird psu problem

a c 112 V Motherboard
a c 75 ) Power supply
June 1, 2013 11:12:31 AM

Disassemble everything. Make sure that no component is connected to any other component. This includes the motherboard, power supply, case, HDD, GPU, RAM, CPU, etc.

Once every component is free, do the following.

1. Plug in the 24-pin motherboard power connector.

2. Plug in the 8-pin CPU power connector.

3. Plug in one DIMM of RAM.

4. Plug in the CPU. (NO COOLER).

5. On the back of the PSU, there should be a small switch with numbers like 110V-127V and 220V-240V. Make sure it is set properly for your region.

6. Turn on your computer with the big red power button on the motherboard located at the top right corner.

7. Connect to a monitor. Try different video output if one doesn't work.

See if you can POST and get a display with that. Make sure nothing else is connected except for what I have listed above.
Related resources
June 1, 2013 11:12:59 AM

SR-71 Blackbird said:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

EVGA makes some good cards but not PSU's ^ I would get an XFX by Seasonic


Read a review somewhere saying it was good. I wish I had read more forums before I bought it, everyone seems to recommend Seasonic. I'm thinking of calling newegg and seeing if they'll let me trade it.

Thanks for the advice.
a c 112 V Motherboard
a c 75 ) Power supply
June 1, 2013 11:14:38 AM

Seasonic is arguably the best PSU OEM as of right now.
June 1, 2013 1:23:50 PM

ksham said:
Disassemble everything. Make sure that no component is connected to any other component. This includes the motherboard, power supply, case, HDD, GPU, RAM, CPU, etc.

Once every component is free, do the following.

1. Plug in the 24-pin motherboard power connector.

2. Plug in the 8-pin CPU power connector.

3. Plug in one DIMM of RAM.

4. Plug in the CPU. (NO COOLER).

5. On the back of the PSU, there should be a small switch with numbers like 110V-127V and 220V-240V. Make sure it is set properly for your region.

6. Turn on your computer with the big red power button on the motherboard located at the top right corner.

7. Connect to a monitor. Try different video output if one doesn't work.

See if you can POST and get a display with that. Make sure nothing else is connected except for what I have listed above.


Thanks for the reply but I already tried every troubleshooting step. I can't even get the "no ram" beeps with just the motherboard and cpu. It's like the cpu connector isn't making contact or isn't responding fast enough when the motherboard tells the psu to activate.
a c 112 V Motherboard
a c 75 ) Power supply
June 1, 2013 1:40:47 PM

"no ram" beeps? I don't understand your post.
June 1, 2013 2:02:40 PM

ksham said:
"no ram" beeps? I don't understand your post.


You get three beeps if you try to boot with no memory installed.
a c 112 V Motherboard
a c 75 ) Power supply
June 1, 2013 2:13:22 PM

Why did you try to boot with no memory installed?
June 20, 2013 3:24:07 AM

I'm having similar issues with an eVGA Supernova 750W and Gigabyte GA-Z77X-UP4 TH motherboard. Sometimes it boots fine, and once it's up and running it's perfectly stable and I can run prime95 and what not. But then when I switch it off and come back next day it won't come on, quick spin of fans then nothing.

Like OP I've tested with an old PSU and it works flawless, although I had to disconnect the GTX580 as it can't power it. I got hold of a CM 700W psu for test purposes and am now testing complete rig with that one, so far no issues at all.

It seems to me that either one of the eVGA protection circuits is acting up, or as OP mentioned it's something with the CPU voltage not kicking in timely... I get the same phenomenon with the other PSU's if I don't connect the 4 (or 8) pin CPU connector.


I guess there's no point RMA'ing the PSU then... either get another PSU or another motherboard?
a b V Motherboard
June 20, 2013 11:35:25 AM

"I get the same phenomenon with the other PSU's if I don't connect the 4 (or 8) pin CPU connector" DUH!!

Perhpas the problem is not with the PSU but with the user not plugging in the 12v power connector.

Also, if the PSU comes with a 4 pin molex connector that seems not to fit the 12v connection then it could be that it's not the 12v connector but is a connector for the video card, (which actually happened in another thread).

The Question that needs to be asked is what is your household voltage requirement?
The EVGA is 120 volt, the Dynex could be either 100 volt or 120 volt.


Dynex specs -
http://www.hardocp.com/article/2008/05/13/getting_best_...

EVGA Specs -
http://pcpartpicker.com/part/evga-power-supply-120pg065...

Best solution

July 9, 2013 6:53:04 PM
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tedtedtedt said:
Hi guys, I'm having a problem getting my computer to boot with a 650w EVGA Supernova power supply. It works fine with a 400w Dynex I bought to test out. I thought that meant that the EVGA was bad, so I RMA'd it. The new one they sent has the exact same problem. I plugged in a power supply tester and it says the EVGA is fine.

The issue is that the fans and leds come on for an instant and it immediately shuts off.

Could there be an issue with this particular power supply/motherboard combo?

Components:
CPU Intel Core i7-3770K
Motherboard Gigabyte GA-Z77X-UP5 TH
Memory Corsair Vengeance 32GB (4 x 8GB) DDR3-1866
Storage Sandisk Extreme 240GB SSD
Case Thermaltake Soprano
Power Supply EVGA Supernova 650W ATX12V / EPS12V


I have the same motherboard and purchased the EVGA NEX750G PSU. Turns out that EVGA PSU's have compatibility issues with the Z77's (and other Gigabyte boards as well) (see this: http://www.amazon.com/review/R37HZDFV63OFYL/ref=cm_cr_r...). I RMA'd mine for the "fixed" version and still no dice. I even updated my BIOS to Beta F12e and nothing. Guess I'll have to fall back to my other PSU for now.
!