PC randomly shut off, and wont turn back on

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sweg4 life

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Oct 22, 2014
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My PC completely shut off and right afterwords i tried turning the PC back on and i got nothing. Then after disconnecting the PSU and reconnecting it i got an extremely quick flash and turn of my LED fans and a red light on my mobo. If i try turning it on again i get nothing. I can only get a flicker if i wait about 5 minutes before trying again. I have already opened up the PC and checked all the wires and everything looks good. I was wondering if there are any sure ways to check if my PSU is fine without a voltmeter, and if you guys think this sounds like more of a PSU, CPU or mobo issue, thanks.
 
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Sentey reviews are extremely few and far between, only seeing four out of 50+ models ever reviewed at least once. From so little data, it is difficult to gauge whether those few positive results are exceptions or the norm for the brand.

Some people have complained that their Sentey PSU was low on the 12V rail, one of them saying his PSU dipped as low as 10.6V under load. I'd expect most PCs to shut down before 12V got that low but if it didn't, I can imagine how the GPU and CPU VRMs might not appreciate the increased high-side on-time it. If your PSU had that issue, it may explain how the GPU died.
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gbehlpnu

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Jan 17, 2018
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teste with another powersupply, but it sounds like your power suppy is bad

 
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Titan
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May 18, 2007
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You need A LOT more than just a voltmeter to correctly test a PSU. You need $1000+ worth of electronic loads to simulate the PSU's workload and an oscilloscope to monitor the PSU's response to load changes.

For a normal person, trying a different better quality PSU (unless the current one is already of pretty good quality, then similar quality is adequate) is a much simpler and cost-effective test.
 
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sweg4 life

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After unplugging the PCI-E cables on my gtx 970 the PC now boots up completely fine, does this mean my GPU is broken or is it a problem with the MOBO, i have another PCI-E slot but its an 8x not 16x will that impact performance or cause problems if i try putting the 970 in that slot?
 
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sweg4 life

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I have had the PSU and GPU both working together for about 2 years perfectly fine, you think just randomly the PSU would be stable enough to run the PC without the GPU instead of failing completely ? I also checked my bios and the voltage is at 12.096 system, 5.080 system, and .008 for the internal gpu since i cant get bios to boot up with my 970 plugged in.
 
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InvalidError

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Titan
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The most common PSU failure mode is the output capacitors degrading over time due to exposure to high temperatures, ripple current and voltage overshoots. A poor or passable quality PSU will work "fine" for a year or two. Then, as the capacitors get worse, voltage ripples increase and you begin getting the occasional crash/reboot. This gets progressively worse until the PC just won't boot anymore.

Depending on how quickly the PSU degenerates, which varies wildly depending on component and build quality for this particular failure mode, the time between the first crash/reboot clearly attributable to the PSU and the PC becoming unusable can be anywhere from days to months.
 
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sweg4 life

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I guess i'll just have to get a new PSU and see what happens, what brands do you think are the safest options, and ill probably be getting a 600-650 watt one.

 
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sweg4 life

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alright, thanks I ordered a new PSU, hopefully that fixes everything.
 
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sweg4 life

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Well the new PSU has changed nothing the computer will still not boot up as long as the 970 is plugged in so i'm assuming now that the 970 is the problem, and i'm going to try and go through the RMA process.
 
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sweg4 life

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sentey 750w modular 80plus bronze
 
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Titan
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May 18, 2007
23,815
5,265
108,890
Sentey reviews are extremely few and far between, only seeing four out of 50+ models ever reviewed at least once. From so little data, it is difficult to gauge whether those few positive results are exceptions or the norm for the brand.

Some people have complained that their Sentey PSU was low on the 12V rail, one of them saying his PSU dipped as low as 10.6V under load. I'd expect most PCs to shut down before 12V got that low but if it didn't, I can imagine how the GPU and CPU VRMs might not appreciate the increased high-side on-time it. If your PSU had that issue, it may explain how the GPU died.
 
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