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PC not booting up, cpu led on, reboot loop

Tags:
  • Reboot Loop
  • Power Supplies
  • CPUs
  • Motherboards
  • Hardware Problem
Last response: in Systems
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September 19, 2014 5:25:18 PM

Hello forum!

Today I come here asking for help for a quite odd behavior of my PC.

This is my first PC and I got it about a month and a half ago. The only problem I had while building it was a bent cpu socket pin that I fixed without problems. Everything was working perfectly until earlier today.

When I tried to start the system, it only turned on for a second, the cpu led turned on, and the system shut down; then it turned on again by itself, cpu led, shut down, then repeat. Only if I switch off the psu or keep the power button pressed I can stop the loop.

Because the cpu led was on, I assumed it was a cpu related problem, I removed the cpu, checked the socket pins, power cables, psu... and physically there was no problem. I reassembled everything and tried again, the same... then I got frustrated, left it off for a couple of minutes, tried agin and it boot up normally.

I used it without any problem, I checked the voltage regulation, temps, everything was working normally. Then I had to shut it down because I had to go somewhere. When I came back and tried to turn it on, the same problem started again, the reboot loop. I shut it down, left it off for a minute, turned it on and everything was normal.

What you think could be the reason of this?

The main specs are:
Intel Core i7-4770k
Asus Saberthoot z97 Mark 1
Corsair Vengeance 32GB
Asus GTX 780 Ti
Asus GTX 750 Ti
Corsair AX860i

Edit:
After statring to disconnect the cables from the psu for further testing, I noticed that the cpu power cable wasn't completely plugged in. I pressed it to plug it correctlyand all the problems were fixed. This is a good example that shows that one should always double check that all components are correctly installed.

More about : booting cpu led reboot loop

a b ) Power supply
a b à CPUs
a b V Motherboard
September 19, 2014 5:39:03 PM

The best way to troubleshoot an issue like this is to take the system down to bare minimums - mobo, 1 stick of RAM and CPU (using onboard graphics). If you can't get it to fail, add back components until you get a failure. Virtually any of your components could be causing the issue....if it happens 100% of the time - much easier to diagnose....

Experience tells me that this would either be related to the mobo or PSU - with the PSU being the most likely component to fail.
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September 19, 2014 5:48:31 PM

ronintexas said:
The best way to troubleshoot an issue like this is to take the system down to bare minimums - mobo, 1 stick of RAM and CPU (using onboard graphics). If you can't get it to fail, add back components until you get a failure. Virtually any of your components could be causing the issue....if it happens 100% of the time - much easier to diagnose....

Experience tells me that this would either be related to the mobo or PSU - with the PSU being the most likely component to fail.


I don't think it's the mobo. As I said, everything worked perfectly for over a month, but I'm thinking of the psu.

Last two days, but only a couple of times, when I started the PC, it shut down and turned on again to a message saying that there was a power surge and the mobo protected the system, I pressed f1 and booted up normally. I thought it was my electric instalation and didn't care about it, but now I think it was the psu itself
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Best solution

a b ) Power supply
a b à CPUs
a b V Motherboard
September 19, 2014 5:55:30 PM

If you have had storms recently - a power surge is a possibility....or the PSU actually going bad. Surge suppressors are supposed to protect - but depending upon the type it may or may not protect you. As they age, they lose effectiveness....(I have heard anywhere from 5 to 10 years).

I would definitely look at replacing the PSU and see if that solves the problem - given the additional information - I would place my bet on the PSU.
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September 19, 2014 6:05:11 PM

ronintexas said:
If you have had storms recently - a power surge is a possibility....or the PSU actually going bad. Surge suppressors are supposed to protect - but depending upon the type it may or may not protect you. As they age, they lose effectiveness....(I have heard anywhere from 5 to 10 years).

I would definitely look at replacing the PSU and see if that solves the problem - given the additional information - I would place my bet on the PSU.


I'll see if I can get the warranty going for the psu, for a month old it shouldn't be having this problems then, but if the problem , I'll check the mobo.
Thanks for your help ronin!
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a b ) Power supply
a b à CPUs
a b V Motherboard
September 19, 2014 6:06:12 PM

Your welcome. Corsair makes good PSUs - but there is always one that dies before it is supposed to....
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