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Power shutting off

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  • Components
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September 5, 2014 7:38:37 AM

My computer has started turning off on its own. When I start it back up it will start for a second and then turn off again. It started happening about a month ago and if I left it alone it would usually work later. I used my computer for 5 hours yesterday and no problems. This morning it started turning off again. I was making sure all of the connections were good and I ended up finding that if I held the 24pin power connector secure it wouldn't turn back off. Is this a problem with the motherboard or the psu?

I've had my pc for a little over a year and here is my build.

**CPU** | [AMD FX-8350 4.0GHz 8-Core Processor]
**CPU Cooler** | [Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler
**Motherboard** | [Asus M5A99X EVO R2.0 ATX AM3+ Motherboard] |
**Memory** | [G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory
**Storage** | [Kingston HyperX 3K 120GB 2.5" Solid State Drive]
**Video Card** | [Gigabyte GeForce GTX 760 2GB WINDFORCE Video Card]
**Case** | [NZXT Source 210 Elite (White) ATX Mid Tower Case]
**Power Supply** | [XFX 550W 80+ Bronze Certified ATX Power Supply
**Optical Drive** | [Lite-On iHAS124-04 DVD/CD Writer]
**Wireless Network Adapter** | [Rosewill RNX-N150PCe 802.11b/g/n PCI-Express x1 Wi-Fi Adapter]

More about : power shutting

September 5, 2014 7:50:50 AM

Well you seem to have established that it's definitely a bad connection on the 24-pin, but at this stage it's impossible to say whether it's the PSU plug or the motherboard socket.

The 24-pin plug should be held in place by a retaining clip on the motherboard connector so make sure it's clipped in to place properly. If it is already properly clipped in you'll have to try another PSU if you can lay your hands on one without spending (and possibly wasting) money. Borrow one if you can, though of course it needs to be the correct spec for your system.
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September 5, 2014 8:04:19 AM

Shutoffs like that are often due to overheating, but since you say it doesn't happen when you hold the 24pin in place, perhaps thermal cycling is the problem? Remove and reseat your RAM and both power cables, and see if that helps.
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September 5, 2014 1:47:11 PM

Onus said:
Shutoffs like that are often due to overheating, but since you say it doesn't happen when you hold the 24pin in place, perhaps thermal cycling is the problem? Remove and reseat your RAM and both power cables, and see if that helps.


I tried this first but it didn't work.
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September 5, 2014 1:51:04 PM

Phillip Corcoran said:
Well you seem to have established that it's definitely a bad connection on the 24-pin, but at this stage it's impossible to say whether it's the PSU plug or the motherboard socket.

The 24-pin plug should be held in place by a retaining clip on the motherboard connector so make sure it's clipped in to place properly. If it is already properly clipped in you'll have to try another PSU if you can lay your hands on one without spending (and possibly wasting) money. Borrow one if you can, though of course it needs to be the correct spec for your system.


I used my brothers psu and it was a 750w and the same thing happened. When plugging in the power it would light up and turn off almost instantly. While pushing a little bit on the 24pin power connector it would go a little longer and turn off and the cpu light on the motherboard would light up. I was thinking motherboard but I honestly have no idea.
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September 6, 2014 12:39:16 PM

I got my computer to work. It turns out that when I was pushing on the 24pin power connector it pushed the motherboard back a little too and that seemed to be the fix. I just had to tighten up the motherboard screws. Thank you Phillip and Onus for your quick responses yesterday.
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