Solved My PC starts and then shuts down almost immediately.

April 24, 2015 at 09:32:42
Specs: Windows 7, Core i7 920 2.66GHz / 16 GB
Hello. I've got this issue in my pc for a few years now (I've had this pc for last 5 years). My pc will start and then immediately shut down and same thing keeps on repeating as in a limbo. To fix this, I move/ play with the 24-pin connector (psu to mb main cable) till it comes out of this limbo and starts. Sometimes it starts off and display comes, but most of the time the display is blank and I've to reinstall the BIOS cell to reset it and the display comes after this.

Often times, while working or even while doing normal internet stuff, the pc will suddenly shut down and then won't start and give this same problem. Also, sometimes when I do the normal shut down, the pc automatically starts up after 3-5 seconds and I've to hold the power button to shut it down.

I've narrowed down the problem to be either with my PSU or the Motherboard but I can't put my finger on which one it is. Please help me with this issue. Thanks

CPU: Core i7 920 2.66 GHZ
Motherboard: Asus P6T
Ram: 16GB 1600 MHz
GPU: Nvidia Geforce GTX 760 2GB
PSU: Cooler Master 1000W Real Power
HDD: 1TB Western Digital 7200 RPM


See More: My PC starts and then shuts down almost immediately.

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#1
April 24, 2015 at 13:04:29
Which plug do you move that overcomes the issue, the one at the PSU end or the one at the motherboard end? The trouble would appear to be at whichever end this happens to be, so this should tell you whether it is the PSU or the motherboard that might be implicated.

Have you tried completely removing the plug that does this and re-inserting it firmly? Replacing the cable is a heck of a lot cheaper and simpler to try than either the PSU or the motherboard.
EDIT: See #12 below.

Always pop back and let us know the outcome - thanks

message edited by Derek


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#2
April 24, 2015 at 13:27:40
✔ Best Answer
- check for bad, bent, or burnt pins on the 24-pin main ATX plug & socket; check the 4-pin ATX12V plug/socket as well
- disable the auto-restart feature in Windows
- check your CPU temp readings in the BIOS. If the temp is too high, you'll have to determine the cause (usually a dust-clogged or improperly seated heatsink/fan).
- flash to the latest available BIOS, version 1408
- manually configure your BIOS settings, do not simply "load defaults" & leave it at that

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#3
April 24, 2015 at 21:28:47
Examine the motherboard for signs of possible damage especially 'puffy' capacitors around the cpu. A bad one will often look like a soda can that's been in the freezer too long and have dried residue on top indicating leakage.

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Related Solutions

#4
April 24, 2015 at 22:30:38
@ Derek: It's the motherboard end one that I move/ play along so that the pc starts up. And I've done the removing and inserting the 24-pin connector many times back on the motherboard firmly but it still gives the same problem.

@Riider: The pins appear to be in good shape. I haven't checked the 8-pin (I use the 8-pin instead of 4-pin 12V) and will do it in a while and will let you know. CPU temp readings are within limits and I had recently applied new thermal paste to it so it's cool. Going to flash the new BIOS driver and yes I set the BIOS settings myself so no default there.

@DAVEINCAPS: I'll check the capacitors along with the other wires now to see if they've beefed up or not.

Thanks all for the advice and help, I'll post a follow up after checking it for some more time


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#5
April 24, 2015 at 22:55:35
See if there is anything here that helps.

3 Troubleshooting Tips Guaranteed To Boot Your PC’s Motherboard
http://www.makeuseof.com/tag/3-trou...
The Basic troubleshooting guide is intended to provide you with a guide to problems that you may experience with the system
http://service.msicomputer.com/html...
How to Diagnose Motherboard or Processor Problems
http://smallbusiness.chron.com/diag...
Testing my computer motherboard and CPU for failures?
http://www.computerhope.com/issues/...
How to Troubleshoot for Motherboard Failures
http://www.wikihow.com/Troubleshoot...
Troubleshooting a Computer Motherboard
https://www.ifixit.com/Wiki/Trouble...


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#6
April 24, 2015 at 23:19:21
Ok I've checked the capacitors and they all appear to be in fins shape with no leakage or puffiness. Though the 8-pin 12V cable has a wire with its cover scratched off but the inside wire appears to be fine. The 24-pin ATX connector looks fine as well, will have to remove and check it thoroughly to see the pins

@Johnw: Thanks for the links you shared. I've checked all of them and will be doing a hard reset of my mobo tonight with the battery out. Though I was unable to find which jumper to remove or reset on my mobo.


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#7
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#8
April 25, 2015 at 05:34:14
Based on what you said, a poor solder connection on the motherboard is likely - maybe on the socket itself. Almost always when you move something and there is a change the problem is a connection very close to that area.

Always pop back and let us know the outcome - thanks


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#9
April 26, 2015 at 00:26:31
Ok the PC is stable somehow and starting up on its own without getting stuck or so. Dunno what happened but the last thing I did was to move the 24-pin connector wire near the mobo port. So it seems that the port on the motherboard itself is having issues with the wire (as far as I can deduce myself) with maybe a burned clip/ point or loose one.

@Derek: Its possible that the soldering might've become loose overtime or became faulty. Will have to get that checked out soon then.

Thanks once again all for your help and advices :) Will let you know if something else develops after getting it checked out


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#10
April 26, 2015 at 06:29:36
As said previously, if in doubt change the cable - they are not expensive.
EDIT: Oops, that might not be possible, see below.


Always pop back and let us know the outcome - thanks

message edited by Derek


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#11
April 26, 2015 at 10:01:18
So is it possible to change the whole 24-pin ATX cable? Mine is not a modular power supply so that's why asking

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#12
April 26, 2015 at 12:19:28
Re #11. You are right, that suggestion was my goof. If the cable comes straight out of the PSU then you can't just plug in a replacement.

Always pop back and let us know the outcome - thanks


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#13
April 27, 2015 at 10:59:26
Ah it's ok no problem Derek :)

So I think I'll have to check it out with another power supply of high wattage so as to turn everything in my pc on to debug this problem


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#14
May 31, 2015 at 11:03:48
Ok so I'm finally updating this questionnaire of mine. I've changed the psu with a Thermaltake 850W one and and the pc is running smoothly with no issues what-so-ever. So what I deduce from all this is that somehow my psu got a faulty or fluctuating voltage output on the 24-pin ATX cable and that was damaging my pc and not letting it start normally. My advice? always buy a fully modular psu so that if anything like this happens, you can change a single cable and not waste money on a whole new psu. Thanks guys for the tips

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#15
May 31, 2015 at 13:19:58
Good to hear and thanks for the feedback.

Always pop back and let us know the outcome - thanks


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