CPU led light and CPU fan keeps turning on and off. Shows no display

Svyankee42 · Jan 25, 2016

Hi everyone,

I'm new to building pc's and it has been a bit of a struggle. Here are my specs:

-Asus H170 Pro Gaming motherboard
-G. Skill 16GB ripjaw v 16gb ddr4-2400
-Intel I5 6500 quad core
-EVGA Supernova NEX 650w+Gold
-CPU fan stock intel
-Corsair 450d case (3 case fans)

The problem that I'm currently having has to do with the motherboard. When I have everything plugged in correctly the motherboard will power on. However the CPU light and fan will turn on briefly and turn back off. It will repeat this cycle until I have to manually power the computer off. When I put in any display ports nothing shows up or no signal is received. So as I am writing this I just got off the phone with an ASUS tech rep and told me it might be my CPU fan and I've already bought a Coolmaster 212 hyper. So I will try that but he said if it isn't then it might be the motherboard and they will send a replacement. I was also wondering maybe if my power supply is not strong enough to handle everything. I don't think this is the case but it was mentioned to me by the ASUS rep. I just wanted to get two cents from other people who may know or want to take a stab at this issue. Thanks and any advice will be much appreciated.

maugusto · Jan 26, 2016

power issue maybe, is the 8pin CPU plugged?
try to put the system working outside of the case, some times if the case touches the motherboard the system shutdown itself for componentes protection

Svyankee42 · Jan 26, 2016

maugusto :

The 8pin is put in correctly. I have tried and put it outside the case as well as only use one stick of ram. But I'm still getting the same response and no boot up into the BIOS as well as no signal to the monitor.

maugusto · Jan 26, 2016

are you using an dedicated GPU or you are going to use the onboard one?
if you go for a dedicated one, check if you get signal from the gpu or from the motherboard itself

Svyankee42 · Jan 26, 2016

maugusto :

I have a EVGA gtx 960. Forgot to mention that. I'm pretty sure the signal that flashes is the motherboard itself since the light turns on and off in accordance to the CPU fan. Not sure if that answers that. Apologize in advance for being an amateur.

maugusto · Jan 26, 2016

do a Cmos reset and take out the GPu and plug the display in the motherboard and see if you get a post

Svyankee42 · Jan 26, 2016

maugusto :

I have yet to do a COMS reset. I'll do that when I get home and keep posted on the status.

Svyankee42 · Jan 26, 2016

maugusto :

So I reset the CMOS and the GPU. Still getting no post and having the same problem with the motherboard powering on but the CPU fan just turning off and on as well as the CPU light

maugusto · Jan 26, 2016

check if the cpu and cpu socket are good + test with a diferent ram

Svyankee42 · Jan 26, 2016

maugusto :

CPU sockets look fine as well as the the motherboard sockets that are housing the CPU. Still having the same problems. I don't have any spare RAM at the moment. I guess I can order some to check.

Svyankee42 · Jan 26, 2016

I think it might be a PSU problem because the PSU is turning on and off in accordance to the same issue on the motherboard. It might not be getting enough power to the MB for some reason.

maugusto · Jan 27, 2016

today, the motherboard controls the PSU, so to test the PSU you need a different computer (knowing that it works fine) or a PSU tester + some load on the 12v rails

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