PC Randomly Shuts Down

[RadiatingLight]

So basically, my PC just randomly shuts down sometimes. I don't even know where to start on troubleshooting, because this issue just popped up about 2 days ago, and I changed literally NOTHING about my computer. didn't open it up or anything.

 

so what could it be?

what troubleshooting steps should I take?

[scottyseng]

15 minutes ago, RadiatingLight said:

-snip-

Is it a software shut down? (Like Windows shuts down for you) Or is it like someone hit the power switch and everything just goes off at once?

 

It's possible the PSU may be faulty.

[RadiatingLight]

5 minutes ago, scottyseng said:

Is it a software shut down? (Like Windows shuts down for you) Or is it like someone hit the power switch and everything just goes off at once?

 

It's possible the PSU may be faulty.

It's not a software shutdown

it's extremely sudden and abrupt. a hard shutdown. as if someone pulled the power cord.

 

PSU is a RM750X from corsair which worked fine for a few months, so I doubt that would be the case, but I'm willing to consider it.

[scottyseng]

2 minutes ago, RadiatingLight said:

It's not a software shutdown

it's extremely sudden and abrupt. a hard shutdown. as if someone pulled the power cord.

 

PSU is a RX750X from corsair which worked fine for a few months, so I doubt that would be the case, but I'm willing to consider it.

Well, I have a AX860i. It had a faulty temp sensor according to corsair RMA. The PSU would trigger overtemp protection thinking it was hotter than it actually was. It had to be RMA'd.

 

It too worked well for a few months until it would randomly shut down and get stuck in a boot loop (Would turn on / off in a infinite cycle). The only way it would power back on was if I unplugged it and waited a 5-10 min.

 

I can't tell if it's the same issue, but it has to be power related somehow if the shutdown is sudden like that.

[RadiatingLight]

Just now, scottyseng said:

Well, I have a AX860i. It had a faulty temp sensor according to corsair RMA. The PSU would trigger overtemp protection thinking it was hotter than it actually was. It had to be RMA'd.

 

It too worked well for a few months until it would randomly shut down and get stuck in a boot loop (Would turn on / off in a infinite cycle). The only way it would power back on was if I unplugged it and waited a 5-10 min.

 

I can't tell if it's the same issue, but it has to be power related somehow if the shutdown is sudden like that.

Strange.

Mine doesn't bootloop like yours did. it just shuts down, and then it's fine for quite a while (30 mins - 1 hour) and then it shuts down again.

benchmarks which draw power (furmark and intel burn test at the same time) don't seem to trigger a shutdown though.

[RadiatingLight]

3 minutes ago, scottyseng said:

Well, I have a AX860i. It had a faulty temp sensor according to corsair RMA. The PSU would trigger overtemp protection thinking it was hotter than it actually was. It had to be RMA'd.

 

It too worked well for a few months until it would randomly shut down and get stuck in a boot loop (Would turn on / off in a infinite cycle). The only way it would power back on was if I unplugged it and waited a 5-10 min.

 

I can't tell if it's the same issue, but it has to be power related somehow if the shutdown is sudden like that.

I might swap in my spare PSU (Rosewill quark 550W) just to see if the issue goes away

 

could this in any way be related to my PC being plugged into a UPS? maybe the square waves aren't good for the power supply??

[scottyseng]

5 minutes ago, RadiatingLight said:

Strange.

Mine doesn't bootloop like yours did. it just shuts down, and then it's fine for quite a while (30 mins - 1 hour) and then it shuts down again.

benchmarks which draw power (furmark and intel burn test at the same time) don't seem to trigger a shutdown though.

Yeah, for me, it was completely temp related regardless of the load placed on it (It too survived furmark / Intel Burn Test) while overclocking. It would sometimes run for many hours (10+) without issue. And some other times it would shut down after like 10 min. It kind of aggravated me because I couldn't trust the PSU to work or not (I don't like losing my work). I even forced the fan to run 100% and it would still randomly shut down due to the faulty sensor.

 

Yeah, I could tell it was the PSU because I swapped to my old one (Cooler Master Silent Pro M 700W) and that ran fine. It might be the same case for you, but you have to test and check.

 

Finally, what exact UPS is it? It should be fine if it's a standby UPS. The PSU only gets square waves (I still don't like square...I'd put stepped sine as my min quality for UPS units) when the battery is on. However, some PSUs do consider square waves as power failure (They don't accept it as power) and may turn off anyway...you should test the UPS by unplugging it and seeing if the PC still stays on.

[RadiatingLight]

Just now, scottyseng said:

Yeah, for me, it was completely temp related regardless of the load placed on it (It too survived furmark / Intel Burn Test) while overclocking. It would sometimes run for many hours (10+) without issue. And some other times it would shut down after like 10 min. It kind of aggravated me because I couldn't trust the PSU to work or not (I don't like losing my work). I even forced the fan to run 100% and it would still randomly shut down due to the faulty sensor.

 

Yeah, I could tell it was the PSU because I swapped to my old one (Cooler Master Silent Pro M 700W) and that ran fine. It might be the same case for you, but you have to test and check.

 

Finally, what exact UPS is it? It should be fine if it's a standby UPS. The PSU only gets square waves (I still don't like square...I'd put stepped sine as my min quality for UPS units) when the battery is on.

It's an APC Back UPS PRO 1500.

 

https://www.amazon.com/APC-Back-UPS-Battery-Protector-BR1500G/dp/B003Y24DEU/ref=sr_1_1?s=pc&ie=UTF8&qid=1488349187&sr=1-1&keywords=apc+back+ups+rs+1500

 

I can't seem to find when it outputs square waves, and what type of waves it even outputs

 

 

[RadiatingLight]

@scottyseng I found it outputs a stepped sine wave. not a square.

so that should be fine, right?

[scottyseng]

3 minutes ago, RadiatingLight said:

-snip-

http://www.apc.com/shop/us/en/products/APC-Power-Saving-Back-UPS-Pro-1500/P-BR1500G

 

It's stepped sine.

 

Yeah, stepped sine is good.

 

I wish you luck with testing though...the suckish part about RMAing the corsair PSU is that you have to send them the PSU and all of the cables...unless you do the advanced RMA (Where they send you PSU first and then you send yours) because it really sucks to unwire the PC (Especially if you spent a lot of time cable managing like I do).

[RadiatingLight]

Just now, scottyseng said:

http://www.apc.com/shop/us/en/products/APC-Power-Saving-Back-UPS-Pro-1500/P-BR1500G

 

It's stepped sine.

 

Yeah, stepped sine is good.

 

I wish you luck with testing though...the suckish part about RMAing the corsair PSU is that you have to send them the PSU and all of the cables...unless you do the advanced RMA (Where they send you PSU first and then you send yours) because it really sucks to unwire the PC (Especially if you spent a lot of time cable managing like I do).

thanks man!

 

I will try to troubleshoot a bit more before requesting an RMA. Thanks for your help.