pc shutdown unexpectedly and restarts on its own after a few seconds

royrakesh · Jul 21, 2015

My 7 months old pc shus down on its own(like it is unplugged from power outlet) without any error message or blue screen and restarts immediately after a few seconds on its own. There is no specific time when its gonna happen but when it does it will happen many time. It happens without any load or medium to high load on cpu, so no issue of processor load, means it can occur any time whether i just log on to desktop or in bios screen or playig any games or watching a movie or working on any software. It also occurs when ups power shifts from battery to main, often though( 2 month old apc ups). Checked for ram errors in windows memory diagnostic tool, no issue, I even disconnected the hard disk to see if it happens and yes it happened. The most important thing is there is no performance issue when the pc is running, means it is running very smoothly when working, and there is no overheating issue also(processor 36-39 in idle, 50 in full load, hdd 33,) so i imagine it can't be a motherboard or processor problem. But shutsdown unexpectedly and that is very frustrating.
Pc cofig.
Gigabyte B85MD3H rev2.0
Intel i3 4150 3.5ghz
Corsair Vengeance 4gb 1600mhz
Corasair VS450 psu
no dvd drive, i use a portable dvd drive when needed
2 80mm case fan and 1 120mm led case fan
local cabinet mesh type
allthese bought on same day

C12Friedman · Jul 21, 2015

What is the exact model of UPS you're using with this machine? One of the problems that seems to come up often is the use of PSU's with Active PFC (Power Factor Correction) with UPS's that have a square wave or simulated sine-wave (depends on the "steps" used to simulate the wave) as they don't seem to play nice together.

royrakesh · Jul 21, 2015

its APC back ups BX600CI-IN 600 va 360 watts 2 months old, and my power requirement is around 200 watts based on the calculation from extreme.outervision, I was using a local iball ups 600va, the problem first started with that over 3 motnhs ago, then i changed the ups to this APC 2 months ago thinking the problem will be sloved because that iball one was 5 years old(battery changed 1 year ago though) but, the problem still remains and it is increasing day by day.

C12Friedman · Jul 22, 2015

Except for the statement that they use "Stepped Approximation to a Sine Wave", APC provides very little output information but in comparing it to one of their "PRO" models (previously it was reported their "PRO" models are compatible with Active PFC PSU's) the frequency is wider which seems to indicate to me that the steps are larger making them too great for the Active PFC of your PSU. At this point I'm going to recommend contacting APC (by phone or e-mail) and inquiring with them about compatibility of that UPS with your PSU - let us know what they say (I'm personally wagering they'll say it isn't).

royrakesh · Jul 22, 2015

could it be a psu fault because I have contacted corsair technical team couple of days ago using their ticket system asking about the same question, and they replied with this

19/07/2015)
"Please contact the store or indiaservice@corsair.com and they'll be able to help you RMA it through their distributor within the country. RMAing through this ticket system would otherwise require it to be sent to our closest RMA depot which is outside of the country"

Then i relpied

20/07/2015)
"Couple of days ago I found that this psu is in testing phase with haswell cpu as it is quoted in your website "likely compatible", so my qustion is if I get a replacement unit of this same psu will that problem occur again in my pc? Yeah my mistake i should have checked this compatibility issue before buying this particular model"

Then they replied with this yesterday:
"I would not be able to answer that question as of yet, unfortunately, as we have indeed yet not verified for this PSU to be fully haswell compatible when using sleep states"

C12Friedman · Jul 22, 2015

I don't think the Haswell sleep state is the issue here since you say it can happen anytime, not just in low power states. While it could be that the PSU actually is the fault here, I'm still staying with incompatibility with the UPS. It seems to me that your power grid is somewhat wonky which is tripping the UPS's overvoltage or undervoltage thresholds which in turn causes the UPS to attempt to deliver battery power to the PC hence causing the shutdown.
I went through that a few years back after upgrading my PSU to one with Active PFC, what you describe fits what I dealt with then.

royrakesh · Jul 22, 2015

Thank you a lot, now exactly what should I do, contact local APC techsupport and ask them about the compatibility issue?

It happened almost 200 times this past 2 and 1/2 months, this much unexpected restart can shorten the lifespan of the motherboard and cpu and specially the hard disk, am I coreect?
It happened again when I was updating this thread so you can imagine how irritating this problem would be, sorry for my bad english.

C12Friedman · Jul 22, 2015

royrakesh :

That's what I would recommend doing, they should be helpful.

royrakesh :

I'm sure there's some degradation, it's definitely not helping the system.

royrakesh :

Yes, yes I can.
In re-reading the symptoms, I do have a question which may indicate I missed something earlier - NM, I found it [strike]you've only been using this UPS for ~2 months but it seems you've had this problem longer, is that correct? Was the PC on a different UPS before that?[/strike]

royrakesh · Jul 22, 2015

yes it was on a different ups before this one, i mentioned that before i was using local iball ups. before using this Apc one i was facing the same problem for about more than 1 month(before Apc) and it wasn't this bad which is right now(6-8 times a day), last 3 weeks it has become a nightmare for me, and the problem is increasing day by day.
As you said, I contacted apc loacl tech support and they asked me to know the wattage of my PC, and I replied them the wattage is 220 watts at 100% load and 194 watts at 90% load.

C12Friedman · Jul 22, 2015

Nothing more? Are they looking into it or... did they offer more information?

royrakesh · Jul 22, 2015

this is the exact email they replied me after I gave the wattage information:
"As per your mail, I would like inform you that, load connected to the ups is within the ups output capacity,kindly request to provide me your complete address, so we can arrange an engineer to check and resolve the issue with the unit at the earliest"

now tell me what to do?

C12Friedman · Jul 22, 2015

I guess wait for the engineer - seems a little strange to me but I'm a little confused (we can blame APC's marketing for that) about where they are taking this. Unless they're looking to find that the output wave is out of spec or something like that, I just don't know. I could speculate some here but it would provide no benefit so... give them your address, make an appointment and wait and see

royrakesh · Jul 22, 2015

this is the latest comment from Corsair tech support:
If you're able to get a refund, or an exchange for a unit that is already tested to be compatible with Haswell's sleep states, you can do that. Otherwise, you can also not use the sleep feature for your computer in the time being.

And yes I will give apc team my address for a appointment but not in this week, cause this week I have a tight schedule.

C12Friedman · Jul 22, 2015

I'm going to suggest something here that may seem a little strange, and say to try running it straight from the wall. I understand that your power grid isn't the most stable but the function of the Active PFC will compensate for most power fluctuations. If you find it runs better off of the UPS, you can be fairly sure that's a compatibility issue. There should be little detriment to the PSU to run it without a UPS (a surge protector would be a good thing though just to be safe against huge spikes)

royrakesh · Jul 22, 2015

Yeah last night, I ran it directly to the wall outlet and the same problem happened again twice, I ran my pc for about 40 minutes with same problem 2 times, so definately this isn't UPS compatibility, the monitor was on with ups battery though. The psu maybe somewhat damaged because I enabled the sleep mode lot of times in the past without knowing the compatibility with haswell. Yeah the power grid is not so stable, it fluctuates(not all time) very little but it does.

What brand surge protector do you suggest for this conditions?

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