Weird problem with Seasonic X-660

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jagui

jagui

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Apr 30, 2013
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I am cornered here. Can't turn my PC off. If I do, my system won't turn on. A few weeks ago I started getting delays when turning on the system, meaning I had to wait like 5-10 seconds until the system started to receive power. After a while, I couldn't turn it on completely. The PC is new so I returned it to the store where they assembled it and after 2 weeks (just to check the damn computer!) the technician told me there is nothing wrong with it and that it works perfectly, and he was right until now.
I have the same problem now. The PC won't turn on or will turn on for a split second. I have managed however to turn it on with the following steps:
1. Short the PSU_ON pin to ground
2. Wiggle the AC cable a bit causing sparks
I have done this 3 days ago, and you really can't tell there is anything wrong after long sessions of gaming and folding all night long. So what's really wrong here? PSU? Mobo????
 
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jagui

jagui

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Apr 30, 2013
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I just can't afford to be without a computer right now, as I really need word and orcad to finish my electronics project. Is leaving the PC on "forever" an option?
 
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jagui

jagui

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Apr 30, 2013
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As of today and after 16 hours of full power folding the computer still runs perfectly (aside from the fact it's a bit hard to fall asleep). What's causing this mess??? Is the PSU to blame or something else??
 
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Pinhedd

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Aug 7, 2007
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Probably the PSU, but not definitely the PSU. Try testing it on its own with a jumper (short the green wire to a black wire on the 24 pin connector). If it turns on reliably 100% of the time, it's probably okay.

My concern is that you have to wiggle the AC cable a bit to get it running and that it sparks while doing so, this is extremely abnormal and may indicate that the ground wire isn't connected properly.
 
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jagui

jagui

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Apr 30, 2013
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You were right. I tested the AC cable ground. No continuity. My computer wasn't even grounded all this time. I changed the cable ( a good one), but the sparks and the problem still remain. *EDIT I am pretty sure the ground on the wall outlet is okay
 
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Pinhedd

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Aug 7, 2007
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Excellent. The PSU will not turn on if there's no ground continuity, but it may not require sustained ground continuity to keep running. Keep at it.
 
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jagui

jagui

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Forgot I had an old crappy 400W PSU laying around. I swapped it with the Seasonic and I have now no problems turning on the computer. However it doesn't fit the case, lacks many connectors and doesn't have enough wattage to power a GTX 670 (or the DVD burner, the second hard drive and the case LEDs). The Seasonic PSU is the problem. I now have to fight for an RMA.
 
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Marius Closcaru

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Aug 6, 2013
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I am having the same issue with a Seasonic X-760. The guys at the warranty are also saying that the the PSU is ok. It really is a weird problem and I'm not sure that I will be able to get it fixed or replaced.
 
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