Is my PSU faulty?

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arnoldpalmer

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Sep 7, 2014
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I just received my PSU and all other hardware for my build but I could never get the system to boot up or even beep. I thought the problem was the motherboard since I could get power to my GPU but as I was disassembling all the hardware, I finally got the PSU and fans to turn on when the CPU power was not connected. This seemed strange, so I connected the power back and tried to boot but nothing. The PSU and fans only turn when there is no power to the CPU.
 
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InvalidError

InvalidError

Titan
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May 18, 2007
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A defective PSU is one option (would need the brand and exact model number along with system specs to determine how likely that is) but another very common cause is a short somewhere such as misplaced motherboard tray stud or rear IO plate finger sticking inside a connector.
 
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arnoldpalmer

Reputable
Sep 7, 2014
14
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4,510


The brand is a SeaSonic 550W G series

My specs:

Asus H-97 Plus

G.Skills Ripjaw 8GB Ram

Asus DirectCU II R9 280 GPU

Intel i5-4590 haswell refresh

Crucial MX100 256GB SSD


 
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olsaltydog

olsaltydog

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Jul 3, 2013
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Check as mentioned the studs and faceplate. Start by removing everything but mobo and cpu see if it boots. Then if it boots add one component, a lot of mobos and ps have a power check first if it passes will boot to bios. Do you have a speaker for mobo. This will lead to possible bad part, or the ps failing when actually put under a load.
 
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A

arnoldpalmer

Reputable
Sep 7, 2014
14
0
4,510


The motherboard was out of the case and had no studs or faceplate attached to it. I did that and no boot. Speaker cable is plugged in but no beep.
 
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InvalidError

InvalidError

Titan
Moderator
May 18, 2007
23,815
5,265
108,890
550W should be more than enough for your hardware and quality should not be an issue with a Seasonic so that leaves either the motherboard or CPU as prime suspects. Not many ways to test those other than parts swapping.

You might want to try turning the computer on after removing the CPU - inspect the socket for bent pins while you are at it. If you still get absolutely nothing, there may be a short on the motherboard itself.
 
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