Question Fried GPU with out being connected to PSU

[silvernexon]

I recently had a PSU failure ( EVGA 750w fully modular). Replaced with EVGA 750w none modular PSU. Before putting all the panels back on I did a test boot to make sure everything was plugged up. As soon as I hit the power button my GPU (EVGA GTX 1060) started arching and smoke. Computer shut itself off. I then noticed that I did not plug the GPu into the new PSU. So I am not sure how it was getting power without being hooked up to the new PSU. Any and all tips/testing is welcome. Thank you in advance

 

[Nigel Spike]

Assuming the GPU was inserted in the PCIe slot on the motherboard, it got power from the slot if the motherboard was connected to the PSU.

 

[silvernexon]

oh. Dang it could just have been my GPUs time to go. Im worried to put a new GPU in it and it fry.

 

[jay32267]

oh. Dang it could just have been my GPUs time to go. Im worried to put a new GPU in it and it fry.

Two concerns.
I would be concerned the motherboard got damaged due to excessive current as a result of the arcing.
....and I would also be concerned regarding that PSU.
I would....at the very least....check the voltages....before I connected it to anything else.

 

[SkyNetRising]

I recently had a PSU failure ( EVGA 750w fully modular). Replaced with EVGA 750w none modular PSU.

What's the model names of those two EVGA 750W PSUs?
If they are not identical, then PSU cables may not be compatible.

Using wrong modular PSU cables can damage/kill hardware connected.

 

[silvernexon]

New PSU is EVGA 750 N1 None modular.
Old PSU is EVGA supernova 750 G1 80+ gold 750w full modular. Had this power supply since 2016 and used in this new build for 1 year.

 

[silvernexon]

Two concerns.
I would be concerned the motherboard got damaged due to excessive current as a result of the arcing.
....and I would also be concerned regarding that PSU.
I would....at the very least....check the voltages....before I connected it to anything else.

Well from what i can do without a GPU it boots up and stays on with no issues.

 

[jay32267]

Well from what i can do without a GPU it boots up and stays on with no issues.

then I think the PSU is probably OK....but I'm still leery to trust it.
Although I find it odd that the card smoked when the PSU was changed.
...and I still think there could be motherboard damage.

 

[silvernexon]

The mobo should still have warranty as it is barley a year old. So that I can deal with. I am not sure how I would check for Mobo damage

 

[jay32267]

The mobo should still have warranty as it is barley a year old. So that I can deal with. I am not sure how I would check for Mobo damage

Sometimes MB is obvious (visual burns or it smells burnt)......sometimes you can't tell by looking or smelling.
If I had a cheap old GPU laying around.....I might try that.....just to give me some confidence in the motherboard.

 

[DSzymborski]

How did you determine that the old PSU was at fault and not the GPU itself?

Also, this PSU shouldn't be used with this GPU anyway. The N1 is in the junk tier of PSUs.

 

[silvernexon]

Sometimes MB is obvious (visual burns or it smells burnt)......sometimes you can't tell by looking or smelling.
If I had a cheap old GPU laying around.....I might try that.....just to give me some confidence in the motherboard.

Man I just got rid of the 3 that I had when we moved.

 

[silvernexon]

How did you determine that the old PSU was at fault and not the GPU itself?

Also, this PSU shouldn't be used with this GPU anyway. The N1 is in the junk tier of PSUs.

I pulled my old PC out of the closet and plugged the PSU up to that one and it wouldn't even power it on

 

[silvernexon]

How did you determine that the old PSU was at fault and not the GPU itself?

Also, this PSU shouldn't be used with this GPU anyway. The N1 is in the junk tier of PSUs.

Also I bought it in hopes it would fix it but if it didn't I could always return.

 

[DSzymborski]

I pulled my old PC out of the closet and plugged the PSU up to that one and it wouldn't even power it on

An old PC stuffed in a closet could fail for a lot of reasons.

Did you try the old PSU in your normal PC without the GPU?

 

[silvernexon]

An old PC stuffed in a closet could fail for a lot of reasons.

Did you try the old PSU in your normal PC without the GPU?

The fans on the old computer would try to spin then stop. indicating it was getting power.
No i did not test the old PSU with the GPU unplugged

 

[silvernexon]

A little back story on what happened. I was playing some Destiny 2 maybe about an hour then my PC just shut off. No blue scree or anything just complete power down and would not power back up.