Computer won't turn on after a week and a half of use

TurtleXIII

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May 25, 2015
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So I just built the computer beginning of april. (Asus ROG Z370 motherboard) It's been completely fine (besides I messed up the USB 3.0 connector on the motherboard, that's the only known issue). I've been doing everything on it past week and a half, it hasn't had any problems. I also made sure to try and research the problem online and I've come up with a few different issues. But all the threads I'm looking at seem to have slightly different symptoms so I just wanted to double check and make a thread I guess.

I've been monitoring temps of the GPU and CPU while in use most of the time because the computer I had before had some temp problems with the CPU. But fortunately (I guess?) the CPU was at a max temp of 65 degrees C while under (gaming) load and around 25-30 idle. So I wouldn't think that this problem is pertaining to the CPU. I could be wrong though. I'm not an expert. GPU has been running slightly warmer, but only slightly. And not having a GPU wouldn't prevent the PC from starting.

And also I haven't had a problem with turning the computer on and off before. I've had to run updates and I've turned it off a couple nights and it turned back on fine.

I went to bed last night with it on and woke up this morning to it off. I tried turning it on and nothing happened. I made sure the power was on and tried again, didn't turn on. I made sure the socket was working, I unplugged connectors and plugged them back in, still nothing. I tried re-seating RAM sticks and the motherboard power cable (had both off the motherboard for a couple hours before I tried again), still nothing. The only thing that's happened when I turned the power supply on is the Power LED on the motherboard blinks.

The motherboard manual says that the Power LED means the motherboard is getting power but it's in a sleep mode or soft-off mode. But obviously nothing is working to turn the computer on, so is this a motherboard issue or could it be a power supply issue or possibly something else? I'm still within return for amazon so it's not a HUGE deal if I have to return something, I would just rather not if I can fix it. Any other info would be a great help, thanks guys.
 
No I think it's the motherboard. I have had all major components fail in 20 years of building (PSU, motherboard, CPU, memory, HDD, etc.). You do enough of it and you will have a failure at some point. But again based on reviews on that motherboard on user experiences, I would look at that first.

I'm an ASUS motherboard only builder and have had only one fail on me. But they do fail. The ASUS board was a P8P67 Pro for my old Sandy Bridge build that died. I tried an ASRock board as the replacement and it crapped out. Then I found another used ASUS P8P67 on eBay used and bought it. Haven't had a problem since with my 2500K build. It's just headaches with building your own PC.
 
When you said you had to do updates are you just referring to Windows 10 updates or updates for hardware related items? Did you try seating one memory module in individually at a time and test to rule out it's not a stick of RAM that went bad? But back to updates, I have read where some people who did Windows updates said it did something to their firmware or BIOS preventing a boot.

Before getting into detailed hardware troubleshooting, try clearing the CMOS by removing the battery for a couple of minutes (keep AC wall plug unplugged from the PSU before removing battery and keep it unplugged while waiting - once battery is re-inserted, plug back in and test).
 

TurtleXIII

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May 25, 2015
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So I tried the CMOS battery, tested after and the same thing with the Power LED blinking. And then also tried the different RAM sticks. No luck. I also tried using my last cases power switch just in case it was this case's power switch broken and again, no luck.

Edit: And about the updating, yeah I meant windows 10 updates. I was more of saying that powering on and off wasn't an issue before.
 
Well something obviously happened overnight. It could be anything. The first thing I'd try testing is the power supply. Do you have a spare laying around or can you borrow one from someone who does? Then I'd look at the motherboard as suspect. There's an unusually high number of people reporting problems and RMAs on that series from ASUS according to NewEgg reviews (17 one and two star reviews to 27 four and five star reviews on the -E series if that's the one you have). Several with failing memory slots. One guy was told to reset the CMOS and he still couldn't get it to boot as well. I'd suspect that if you can't get your hands on another PSU.
 

TurtleXIII

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May 25, 2015
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Yeah I wish I was awake when it happened. Could have helped. I have another power supply in my old PC that I'll use. I'll test it tomorrow however. Do you think you could check back tomorrow around this time because I'll post my result around then. I have a suspicion that it's the motherboard unfortunately. But yeah I'll post my results tomorrow. Thanks for your help so far.
 


I'll be here (I do not get remote notifications of updated threads so have to check manually).
 

TurtleXIII

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May 25, 2015
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So I tried the other power supply and no luck with it. Should I just assume that it's the motherboard at this point? And if I were to replace the motherboard, and it still doesn't work, would you assume it's still the power supply?

Edit: corrections + Also I guess I should mention it, I just really really don't want it to be the Power supply and doubt it is the problem (again, could be really wrong though). When plugged in the power supply, I plugged in everything besides the two CPU radiator fans (I plugged in the CPU fan thing, I have a kraken x62) and one of the case fans. So i plugged in all the needed things. power to fans shouldn't make it so I can't turn on the PC, right?

I turned on the power supply and the light didn't come on. I switched it on and off a couple times and one time the power LED turned on, then turned off. I switched it off and on a couple more times, then the power LED was flashing, but this time like twice as fast as normal.

So again I FEEL like it's the motherboard but again, I could be wrong. I'm not an expert. It's just that I bought a very nice PSU (Seasonic 80+ Titanium 750W), so I just have my doubts that it's the thing that broke.
 
No I think it's the motherboard. I have had all major components fail in 20 years of building (PSU, motherboard, CPU, memory, HDD, etc.). You do enough of it and you will have a failure at some point. But again based on reviews on that motherboard on user experiences, I would look at that first.

I'm an ASUS motherboard only builder and have had only one fail on me. But they do fail. The ASUS board was a P8P67 Pro for my old Sandy Bridge build that died. I tried an ASRock board as the replacement and it crapped out. Then I found another used ASUS P8P67 on eBay used and bought it. Haven't had a problem since with my 2500K build. It's just headaches with building your own PC.
 

TurtleXIII

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May 25, 2015
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Okay, I think I'll request a replacement then. Thank you for your help! Sorry about the long process.
 

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