shutdowns under load cannot reboot until on/off switch is flipped

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Nightsh4de

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Feb 5, 2015
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Hello, I´m having a tough time with this issue. 2 year old build boots fine, gets into windows 7 - 64 bit Home Premium and runs low intensity programs (outlook, IE, word, excel etc) no problem.

But if I try gaming (any game) or running Prime95, shutdown occurs (30 secs to 2 mins) and I cannot get it to power back up again unless I flip the on/off switch at the back of the PSU. I can then boot up normally without problems. The shut down is complete - just a black screen and all fans stop working.

Temps are fine using HW monitor, CPU idles at 32C mobo at 27C. Gaming temps before shut down around 46C for the CPU so it doesn't look like a temp issue (I`ve reseated the sink about 5 times, each time wiping off the paste and reapplying). CPU is not Oc´d, runs at 4000 (stock). BIOS reports similar temps even after shutdown.

Thinking it might be RAM, I tried memtest86, after 4 passes, no problems found. Also did the windows memory test, no problems found. Tried booting with 1 stick, then the other, then both again - same issue. Tried different frequencies 1333 (BIOS default) 1600, and 2133. Same issue

Swapped out a corsair CX600 PSU that was showing low voltages on the 3.3v. The new PSU shows all correct voltages. Did a paperclip test on this new psu, case fan spins no problem, psu fan starts up and then stops (apparently the tx650 only runs the fan if its under extreme load so I´m thinking its passing this test). Unplugged all connectors and replugged about 3 times. Plugged into wall socket direct as well, same issue.

Drivers are the latest, though I rolled back the catalyst from 14.12 to 14.9. so is BIOS. Reinstalled sound drivers, lan drivers etc. Same issue.

Ran ESET Antivirus, including online scanner from ESET both in safe mode and normal mode - no virus detected.

I even reinstalled W7 just in case - same problem.

I´m starting to lose my mind lol so any help is appreciated

System specs

CPU: FX8350 Black edition 4Ghz
Mobo: ASUS M5A99X EVO R2 (BIOS 2501)
Cooling: Hyper 212 EVO, 2 fans in push pull)
RAM 4x2 MB Kingston HyperX DDR3 2133MHz
PSU Corsair TX650 (v2) replaced Corsair CX600
HDD Seagate 1TB ST1000DM
GPU ASus HD7870 DC2 2GD5 (not Ocd)
 
Solution
ko888


That would indicate that one of the PSU's protection circuits has been triggered.
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Nightsh4de

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Thanks Ko, so could it be that when I demand more power, the wall socket goes haywire feeding too much of something into the psu? could a solution be a surge protector?
 
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ko888

ko888

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Feb 18, 2009
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A surge protector will be of no help.

The PSU's protection circuits (i.e. Over-voltage, under-voltage, over-current, and short circuit protection) protects the PSU's DC outputs.

The CPU and the graphics card are the two devices that draw the most power in your system. From the description of the symptoms it seems that increasing the power consumption of either the CPU or the graphics card eventually triggers a protection circuit.
 
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Nightsh4de

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Ok that makes sense but there must be a spike somewhere because historically the rig has run on these settings for 2 years no problems (with the cx600 as the psu) but perhaps I can try to modify something in bios to curb the issue? Any suggestions are ver welcome
 
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Nightsh4de

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Feb 5, 2015
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So basically the PSU is tripping itself off when it comes under pressure Ive just tried underclocking the CPU and the GPU simlutaneaously but the problem persists. So could it just boil down to a faulty PSU, or should I really be looking to replace CPU/ GPU?
 
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ko888

ko888

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If you don't know if the Corsair CMPSU-650TXV2 is working properly then you will have to try another known working PSU.

The Corsair TX Series has been discontinued. The CMPSU-650TXV2 is a model from back in 2011.

Is the PSU's cooling fan spinning when it's placed under load? Some customers have reported that the fan doesn't spin until the system draws over 350 Watts. It could cause the PSU to overheat and shut down assuming that the PSU has OTP (Over Temperature Protection) (I haven't seen any information that indicates that the CMPSU-650TXV2 has OTP).
 
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westom

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Nobody can answer that (honestly) without numbers. PSU is only one part of a power 'system'. Even a paper clip test cannot say something is good. Test can only identify some defects. A PSU that passes a paper clip test might be good or bad.

Useful answers require numbers. That means about one minute of labor using a digital meter per some requested instructions. Unique numbers provided by that labor mean a next reply answers exonerates or identifies defects - without speculation or doubt.

Normal is for a defective supply to still boot and power a computer for months. Just because a computer was working does not say its PSU or some other part was good. It could have been defective even when purchases. And only now became worse.

Your symptoms imply some protective circuit it tripping. Nobody can say more until numbers are provided.

PSU does not trip off. Another 'system' component decides when the PSU can power on and power off. Again, to say what is happening in your unique system requires those numbers.
 
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westom

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If using shotgunning, then no ned to post. You can select the next best part to replace as good as anyone else (if a new PSU does not cure something).

Again, if it works with a new supply, that still does not mean a defect has been eliminated. It may only cure a symptom, Another problem with shotgunning.


 
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Nightsh4de

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Feb 5, 2015
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So finally solved. I first replaced the motherboard with a sabertooth 990fx r2, which was expensive and didn't solve anything. Rather annoyed I just went ahead and replaced the PSU again this time with a Seasonic S12 and all has been well for over a week.

What I don´t know is if the Corsair TX650 unit I put in replace the failed CX600, was flawed or DOA, or if some other component caused it to fail after only 1 day of proper functioning.

Frankly I suspect the mobo might have had a hand in ruining it all, and by replacing it and then the PSU again, I saved myself from further issues. Who knows! I`m just glad I found the solution, hope it helps other with similar issues.
 
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