Oc'ed CPU to 1.35V now pc won't post

[Hellhunter02]

Hey there tomshardware community!

I just got my i5 6400 with the MSI Z140A gaming m3 mobo and it worked fine for the first 2 days. I oced my CPU up to 4,1 ghz with 1.35V on it. Then I kinda wanted to squeeze out more and it wouldnt let me overclock at all anymore. So I reset everything, flashed the bios again and then I tried to put it at 4,4ghz at 1.35V.

The system restart and then it just didn't post anymore. The mobo is running, the cpu cooler is constantly running and the gpu fan tries to start each fan for about half a second and does that repeatedly. Also the CPU Led on the ez debug panel is lit up.

What I already tried:
- Leaving cmos battery out for hours
- Reattach every cable to the MB
- Reseat CPU and RAM
- Let it sit in this state for 10 minutes
- Tried launching without GPU
- Tried the slow start switch on the MB


I have ran out of ideas but I don't want to see something die, because even this upgrade was just about in my budget so I would have to roll without a pc for a few months which would suck really hard

 

[Paul NZ]

Did you plug the CPU fan into the header on the mobo?

 

[Hellhunter02]

Yup. Its also spinning normally like the case fans, just the gpu does this weird stuff with trying to spin and then stop. I also removed my ram just to test and it changed nothing.

 

[Paul NZ]

Read the manual about that LED, it'll tell you why it's lit up. And hopefully why and how to fix it

 

[Hellhunter02]

It just says 'indicates CPU is not detected or fail'

 

[faalin]

Hey there tomshardware community!

I just got my i5 6400 with the MSI Z140A gaming m3 mobo and it worked fine for the first 2 days. I oced my CPU up to 4,1 ghz with 1.35V on it. Then I kinda wanted to squeeze out more and it wouldnt let me overclock at all anymore. So I reset everything, flashed the bios again and then I tried to put it at 4,4ghz at 1.35V.

The system restart and then it just didn't post anymore. The mobo is running, the cpu cooler is constantly running and the gpu fan tries to start each fan for about half a second and does that repeatedly. Also the CPU Led on the ez debug panel is lit up.

What I already tried:
- Leaving cmos battery out for hours
- Reattach every cable to the MB
- Reseat CPU and RAM
- Let it sit in this state for 10 minutes
- Tried launching without GPU
- Tried the slow start switch on the MB


I have ran out of ideas but I don't want to see something die, because even this upgrade was just about in my budget so I would have to roll without a pc for a few months which would suck really hard

Have you read page 39 of your manual as to how to clear the cmos and reset the bios?

 

[Hellhunter02]

Yeah I did. It said I should short JBAT1 with the jumper, but since they didnt include a jumper, I plugged the psi off the wall and just used a screwdriver to short both pins, without any results

 

[Bogdan36]

Remove power cord from PSU, and reset bios by switching the jumper on the other pins while pressing the power button, then put jumper back after you released power button. If you don't have a jumper use a screwdriver to conect the pins and press power button.
Don't forget to remove the power cord from psu in both cases, you don't want to fry your motherboard.

 

[Bogdan36]

Sorry we posted the same time, don't forget to press the power button too.

 

[Hellhunter02]

Thanks for your reply, but pressing the power button didn't work out unfortunately:/

 

[Paul NZ]

If there's no jumper on the CMOS reset header, (and if it should be there) then it wont boot.

But it must have been there if the system was going before

The power needs to be on not off if you short the pwr pin header on the mobo, with a screwdriver.

You dont have to press the power button if you do the above, it should turn on, when you short the pins

And you wont fry the mobo if you short the pwr pins on the header, on the mobo. Thats how you test it to see if it'll turn on