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  #1  
Old 23-05-15, 07:06 AM
jak-a-man jak-a-man is offline
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Exclamation PC Shutting Down Instantly

Hi guys,

I just build my first ever PC a few weeks ago and it was working as I expected it would. Now 3-4 weeks later, when I press the power button it powers on and then shuts down 1-2 secs later and then restarts 2-3 secs later and shuts down again. This process repeats itself until I switch off my PSU. I don't get to see a POST. (System specs below)

Things I've Tried
1. Resetting the bios
2. Powering it on with with multiple combos (motherboard and 1 stick of ram... *tried both sticks in case one was faulty*, with SSD, with HDD, without SSD & HDD, and without GPU.
3. I unplugged all components and did the self test which in on the PSU (Corsair AX760i) and it passed (green light & fans spinning).
4. Unplugged everything from the motherboard and checked for bent pins or any obstructions in ports.
5. Plugged all the components back in but in different ports on the motherboard and PSU.

Now I should note that after each of these steps the computer powered on fine and I was able to run stress test to see if could find an issue with the hardware. I even tried multiple manual reboots and a few hard reboots to see if the problem would persist and it didn't during my testing each time. However, when I shut it down and leave it overnight or maybe a few hours, it again refuses to power on and its right back to square one.

Things I haven't done at the time of this post
1. Remove the motherboard, cpu and cpu cooler. The reason for this is because I haven't been able to get thermal paste as yet so I wouldn't be able to continue testing. So at the moment this is a final option.
2. Booting in safe mode and testing.
3. Wiping my system drive and reinstalling windows.
4. Swapping out components. (first build so I don't have spare parts to fit) I do have my intel stock cooler which I'm wiling to try once I get some thermal paste. (The new CPU cooler was installed a week or so before I started having problems)

System Specs
Asus Z97 Gryphon w/ Thermal Armour
Intel Core i7 4790k
Corsair H100i GTX Liquid CPU Cooler
Corsair Vengeance Pro 16gb 1866mhz
Asus Strix Geforce GTX970
Samsung 850 EVO 250gb SSD
WD Black 1TB HDD
Corsair AX760i PSU

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  #2  
Old 23-05-15, 08:24 AM
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Madmullen Madmullen is offline
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I have had this problem before, have you tried resetting the bios take out the battery then put back, it could be the battery itself, I replaced mine in the end.
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MSI B450 TOMAHAWK
AMD Ryzen 5 2600X 3.6ghz Base 4.2ghz Max Boost
16GB Corsair Vengeance LPX 3200MHz
Alphacool Eisbaer LT 360 CPU Cooler
AMD Radeon RX 590 Sapphire Nitro+ 8GB
1TB HDD
1 x 450gb SSD
2 x 250gb SSD
Corsair RM650 Watt PSU

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  #3  
Old 23-05-15, 05:00 PM
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Bench test is needed here.... remove the H100i and motherboard without needing to remove the pump/cpu block from mobo by removing cables first, unscrewing mobo, then remove screws fixing the h100i to case while supporting it with other hand (laying case on side will help with this) and you should then be able to remove it in 1.

Then plug cables in from PSU and try running it outside of case.....

What you are describing is classic shorting out symptoms, so somewhere the back of the mobo is touching something it shouldn't, usually around the screw / post holes on back of mobo.
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Old 23-05-15, 09:26 PM
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Davva2004 Davva2004 is offline
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Unplug the power switch header from the motherboard and start your PC by bridging the motherboard headers with something conductive, if it powers up fine then the PC power switch is faulty.
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Old 23-05-15, 09:36 PM
Mondo Mondo is offline
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I agree with YouWhat. Had the same issue with build a few years ago. Sounds like a short where the MB may be in direct contact with the case. Try reassembling it all outside the case (MB box is non conductive) If still doesn't post, could be a dead or dying MB. Hope this helps.
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Old 23-05-15, 09:41 PM
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AlienALX AlienALX is offline
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First thing to check in this situation is the socket itself. Take the cooler off, remove the CPU and make sure you didn't bend any pins when you fitted the CPU.

It's single-handedly the main cause of problems like this.

I've also seen a few cases where people fitted the cooler retention incorrectly and it was causing a short on the back of the board.

All of your symptoms point to a bad overclock. However, given that you have reset the bios the next place I would look is at the socket and the pins in it.
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Old 24-05-15, 04:34 AM
jak-a-man jak-a-man is offline
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Quote:
Originally Posted by Madmullen View Post
I have had this problem before, have you tried resetting the bios take out the battery then put back, it could be the battery itself, I replaced mine in the end.
I took the battery out and returned it into the socket but that didn't solve anything. Once you replaced the battery did it ever happen again?

Doule post merged - Please use multi quote

Quote:
Originally Posted by YouWhat View Post
Bench test is needed here.... remove the H100i and motherboard without needing to remove the pump/cpu block from mobo by removing cables first, unscrewing mobo, then remove screws fixing the h100i to case while supporting it with other hand (laying case on side will help with this) and you should then be able to remove it in 1.

Then plug cables in from PSU and try running it outside of case.....

What you are describing is classic shorting out symptoms, so somewhere the back of the mobo is touching something it shouldn't, usually around the screw / post holes on back of mobo.
Followed your steps and got everything out of the case. But before I took the motherboard out I did notice that the thermal armour backplate for the motherboard was in contact with the case so I took off the thermal amour completely.

Then, again after every troubleshooting step I took the system posted but what's new now is that it would shut down a few mins in (5-10 mins) while on idle no matter if I'm in the BIOS or in windows... and its back to square one again with the shut down, restart.
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Old 24-05-15, 12:31 PM
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Davva2004 Davva2004 is offline
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What temperature is it hitting when it shuts down?
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Old 24-05-15, 01:07 PM
jak-a-man jak-a-man is offline
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Quote:
Originally Posted by Davva2004 View Post
What temperature is it hitting when it shuts down?
CPU idles between 31-34 C.
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  #10  
Old 24-05-15, 04:25 PM
jak-a-man jak-a-man is offline
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So I took everything out of the case, took off the h100i gtx, took out the cpu, checked the pins and returned it into the socket, reset the bios and tried powering on with just the stock cooler and 2 rams... 1 ram & no ram. Still no boot with the continuous start up shut down. I assume Mondo is right that I could have just bought a faulty motherboard or a faulty psu.

I can't think about anything else I could do so I'm about to get in touch with amazon about the issue and let you guys know the outcome.
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