Dead power supply?

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WashclothRepairman

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Aug 3, 2014
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Last night there was a loud pop and an ozone smell, (I wasn't actually gaming at the time so it wasn't under load) and one of the breakers flipped. After hitting that, my gaming PC did not turn on again. The lights on the motherboard still light up, but not the case lights, and pressing the "START" button on the motherboard doesn't do anything, nor does the power button on the case. I assume the PSU is dead.

PSU: Corsair CS850M
Motherboard: Asus Maximus Ranger VII
CPU: I forget exact model, a mid/high range i7 from 2 years ago
GPU: MSI ROG GTX 980
Cooling: Enermax something or other, again I forget the exact model
No overcloacking

I have had no problems with power or overheating prior to this.
 
Solution
InvalidError
If semiconductors died from transients the PSU may have put out when it died, they often fail shorted. PSU rails getting shorted by the GPU's VRM would prevent fans from spinning up - can't spin fans when the 12V rail is shorted to ground.
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InvalidError

InvalidError

Titan
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May 18, 2007
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Unless you plan on doing SLI, even a 650W PSU would be vastly sufficient at about double what you need.

I doubt that you'd smell ozone coming from a PSU since generating ozone requires a few kV but the 5VSB supply working while the main supply don't does suggest a failure on the primary side of the main supply. I'm guessing the 'ozone' scent is actually from vaporized copper from one of the FETs' leads.
 
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WashclothRepairman

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Aug 3, 2014
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So after the courier lost my replacement PSU and Amazon sent a second one first class mail... no change. Motherboard lights turn on, case lights do not, START button no motherboard does nothing and neither does the power button on the case. No boot up, no errors, no fans, nada. I hope it's not the CPU but I'm out of ideas.
 
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Dark Lord of Tech

Dark Lord of Tech

Retired Moderator
Aug 18, 2009
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Sorry to hear that , I would say most likely the board now , might have been damaged when PSU failed , CPU failures are rare. Could be CPU but doubt it.

I lost my ASUS Hero VI in a bad lightning storm a couple of years ago , I left the house for a couple of hours and returned to a dead system, PSU and board were both toast and I was using surge protection.

Hopefully not the CPU survived.
 
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WashclothRepairman

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Aug 3, 2014
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I changed the motherboard too and still no change, I had a friend that works for IBM take a a look and apparently the video card died. I feel a little foolish not trying that but I am surprised that would even prevent the fans from turning on. I'm starting to fear there isn't much hope for the ssd but it does gives me an excuse to upgrade to a 1080 ti.
 
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InvalidError

InvalidError

Titan
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May 18, 2007
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If semiconductors died from transients the PSU may have put out when it died, they often fail shorted. PSU rails getting shorted by the GPU's VRM would prevent fans from spinning up - can't spin fans when the 12V rail is shorted to ground.
 
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