System turns on and off after replacing cpu and cooler

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sheetka

Honorable
Jan 8, 2013
15
0
10,510
Hi all

Yesterday I updated my bios so that I could add a newly bought 7600k and cryorig h7 to my computer. Everything worked out fine and this morning I actually installed the 7600k and cooler.

After installing both I coulnd't get to turn on my computer anymore. It starts for 1-2 seconds, all lights go on and fans start spinning and then it turns off again and repeats this process until I force the computer off. One thing I've noticed is that the top fan isn't spinning, I'm not sure if this is normal but just pointing out.

I currently placed my old i5 6600 back in with the stock cooler and still have the same problem. I tried replacing the ram sticks, running with only one ram stick, pulled (most) cables out and back in and reinstalled my gpu.

I hope someone can help me fixing this. This is also the first time I replace a component after I build this pc myself last year.

i5-6600 (i5 7600k)
Gigabyte - GA-B150-HD3P
Kingston - HyperX Fury Black 16GB (2 x 8GB)
Samsung - 850 EVO-Series 500GB
MSI - GeForce GTX 1070
NZXT - S340 (Black) ATX Mid Tower Case
Cooler Master - GM 450W 80+ Bronze Certified Semi-Modular ATX Power Supply
 
Solution
Achint2000
You press the power button, everything starts, 2 seconds and it's off, then starts again, off again, keeps repeating, forever, doesn't start.

I've seen the exact same problem on 2 of my old builds. It's a motherboard hardware fault and you CAN NOT fix it.

Sorry for the bad news.

While installing the fan, you might've pushed or broken something inside.

Either that, or your motherboard is getting electrically short from somewhere, so the last thing you can try is take it out of the case, place it on a completely non-conducting thing and then connect stuff, try to start it.

My first build was destroyed randomly, looked just like this but a motherboard warranty replacement fixed it. My 2nd build was destroyed due to a burnt PSU...
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Achint2000

Achint2000

Distinguished
Feb 10, 2013
692
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19,165
You press the power button, everything starts, 2 seconds and it's off, then starts again, off again, keeps repeating, forever, doesn't start.

I've seen the exact same problem on 2 of my old builds. It's a motherboard hardware fault and you CAN NOT fix it.

Sorry for the bad news.

While installing the fan, you might've pushed or broken something inside.

Either that, or your motherboard is getting electrically short from somewhere, so the last thing you can try is take it out of the case, place it on a completely non-conducting thing and then connect stuff, try to start it.

My first build was destroyed randomly, looked just like this but a motherboard warranty replacement fixed it. My 2nd build was destroyed due to a burnt PSU. I'll also get it replaced. And my current build is placed on two rows of wood, on a wooden table.

Good luck. Contact your nearest service center and send your motherboard for warranty repair/replacement is the best you can do.
 
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Solution
bgunner

bgunner

Judicious
Feb 13, 2009
5,144
14
32,515


A bad motherboard is not the only thing that can cause this On and Off repeating issue. The cause is that there is hardware fault. Now this can be a piece of hardware OR a bad BIOS setting. I have seen this happen with the ram not seated properly/bad stick or ram timings/voltage improperly set, GPU not seated or not plugged in, a bad PSU, the CPU cooler tightened to much, and of course a bad motherboard.

But to just say it is a bad board without going through all the trouble shooting is premature, since any RMA will require you to do these steps anyways.
 
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Achint2000

Achint2000

Distinguished
Feb 10, 2013
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I've always used ASUS motherboards, which usually keep the fans running even if there's no CPU, no RAM, no GPU and nothing. Just PSU and Motherboard. My apologies, I was going with that but a damaged motherboard is the case most of the times.

sheetka told that he/she tried most things anyway, that's why I thought it's the case. Anyhow, still try these steps:

Reset the BIOS by either shorting the 2 CLRTC jumper pins on your motherboard or by removing the CMOS battery for 5 mins and putting it back in.

Try getting a spare but a good quality PSU and using it to see if the problem's still there.

Reinstall EVERYTHING one by one. Keep trying to start the PC and see if the problem's still there.

The easiest way of troubleshooting is, you can go to a well known repair shop and getting them to check all your PC parts except the CPU, each one, separately, including the PSU. CPU cooler and the HDDs/SSDs. It's the fastest way as well.
 
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bgunner

bgunner

Judicious
Feb 13, 2009
5,144
14
32,515
FYI the MSI Nvidia GTX 1070, all variants that are not overclocked, recommend a 500W PSU. Now the ones that are overclocked could require more if so it would be 50W more so a 550W PSU would be recommended. Your PSU is a 450W PSU so to start with you are pushing your PSU to the raged edge. No mater what look into getting a more powerful PSU, you just might find this is the issue.
 
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