PC keeps restarting every 2-3 seconds

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classna

classna

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May 16, 2010
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So I build this PC a couple of years ago and all was working fine until recently when my computer suddenly restarted and then did this occasionally. I thought this could be my graphics card heating up or not properly seated so i took it off and reseated it back. The problem didn't go away. I bought a new power supply thinking it might be the culprit but that didn't resolve the issue. When closely inspecting other components, i found some oil around my graphics card that was probably leaking from my gpu fans and could've likely caused a short. i breadboarded my system and cleaned the oil off my motherboard and graphics card. It kept running fine that day but the next day when i tried to turn it on, It started for a second or two and then turned off. it then tried to start again but turned off after a few seconds. I hear no beeps as i don't have a speaker. Sometimes it will stay stable longer and i was able to go to my bios settings but then it restarted again. It is still breadboarded and i unplugged various components one by one to identify the problem. I took everything out and the only thing left there was a motherboard with my processor and stock cooler (removed the after market cooler). it still did the same thing. started for a few seconds, turned off, started again and did this a few times and then my motherboard QCODE showed AO and my PC stayed stable. I added one memory and plugged the monitor to my onboard graphics and connected my SSD. It was able to post and run fine the whole day.

The problem is my computer works fine all day but when the next day, i try to turn it on, it does the same thing. Unplugging the power supply and re-plugging sometimes help getting it started. Could this be my motherboard shorting somewhere?

Here is a list of steps i performed:

1- Cleared CMOS, Flashed BIOS with latest version, removed and reseated the onbaord battery
2- Reset default bios settings
3- Removed after market cooler from cpu, reapplied thermal paste and installed stock cooler (did this a couple of times)
4- Monitored my CPU and Graphics card temperatures and they were normal.
5- Installed a new PSU

My Specs:

- Processor: Intel Core i7 4770K (Stock Cooler)
- Cooler: Cooler Master Napton 280L (removed)
- Motherboard: Asus Maximus VI hero
- RAM: Corsair Vengeance 16GB Dual Channel (2x8GB 1866) DDR3 Memory Kit (CMZ16GX3M2A1866C10)
- Graphics Card: EVGA GTX 750Ti FTW
- PSU: Corsair VS650
- SSD: Samsung 840 Pro 256GB
- Case: Cooler Master HAF XB
- OS: Windows 10 64bit


 
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Dark Lord of Tech

Dark Lord of Tech

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Aug 18, 2009
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PSU: Corsair VS650 is poor quality and also isn't Haswell compatible , Corsair explains it here.


You may have other issues , just wanted to inform you.

When an Intel Core (i3, i5, i7) processor is idle, it goes into a sleep state that requires less power than when the CPU is active. Since the motherboard voltage regulation modules that provide power to the CPU gets their power from the power supply's +12V rail, these sleep states can dramatically reduce the load on the power supply's +12V rail.

According to Intel's presentation at IDF, the new Haswell processors enter a sleep state called C7 that can drop processor power usage as low as 0.05A. Even if the sleeping CPU is the only load on the +12V rail, most power supplies can handle a load this low. The potential problem comes up when there is still a substantial load on the power supply's non-primary rails (the +3.3V and +5V). If the load on these non-primary rails are above a certain threshold (which varies by PSU), the +12V can go out of spec (voltages greater than +12.6V). If the +12V is out of spec when the motherboard comes out of the sleep state, the PSU's protection may prevent the PSU from running and will cause the power supply to "latch off". This will require the user to cycle the power on their power supply using the power switch on the back of the unit.

While we are still working with Intel on the details of the testing methodology they use to check PSUs for Haswell compatibility, it is already known that a power supply that uses DC to DC for the non-primary rails (the +3.3V and +5V) will not have an issue with the new low power sleep states. This is because a DC to DC buck converter is used to convert +12V to +3.3V and +5V. This means that no matter what load the CPU puts on the power supply, there will always be a load on the +12V because the +12V is required to provide power to +3.3V and +5V.

Corsair utilizes this DC to DC technology in most of their power supplies. Starting with the CX750 and CX750M and moving all of the way through the GS Series, TX and TX-M Series, the HX Series, both the AX Series Gold and AX Series Platinum, and the new AXi Series. So whatever your budget, if you choose Intel's new Haswell processor and wish to utilize the new, low power C7 sleep state,
 
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6R1M01R3

6R1M01R3

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Blackbird was VERY thorough with his explanation. So, what model was the previous PSU? If it was the same model then that would perfectly explain the issues, same if the previous was different but still didn't meet the requirements.
 
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6R1M01R3

6R1M01R3

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Most likely, since both PSUs that you have used come to the same flaws. It's not nice to spend more money in replacements but considering that you have an overclockeable 4770k and a Hero VI mobo that is very good for OC, might as well spend on some GOOD PSU, since you might be OCing in the near future.
Take a look at this list and check for one that is in your budget http://techreport.com/review/24897/the-big-haswell-psu-compatibility-list
 
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classna

classna

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May 16, 2010
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So I took my PC to the repair shop and there they tried another PSU. the motherboard light is on but the pc won't start anymore. There were no components or memory installed, just the cpu and fan. It looks like my mobo is acting up. It is under warranty so I will send it back to the dealership for repair or replacement. Thanks for all your help.
 
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