[SOLVED] CPU over voltage

[KKH12345]

Hi all
I have been putting together a beginner gaming PC for my son in an old cabinet. Last time I built a computer was when Pentium was new and cool.Had some issues to get things started, but finally I managed to get it up and running and could get into BIOS settings where everything looked normal. I then installed windows 10 on the SSD from USB and it seemed to work normally. Did several restarts and simple surfing to test and all was OK. When I tried to start it the next day it would stop during POST at Boot device, leaving the Boot device LED lit. I see CPU-LED blink, VGA-LED blinks, but RAM-LED will not blink. I assuem it stops the process before it gets to RAM tests. It will not allow me to enter BIOS. It tells me to push delete or F2 to enter BIOS at start-up, but nothing happens when I do. It only goes over to a screen showing error message that a power surge was detected a previous start-up and that CPU over voltage is detected. It also says that Memory OK! succeeds in system booting. Then nothing more happens and it does not respond. Any ideas?

Asus Z-170 E motherboard
i7 6700k 4,7 ghz processor
2x DDR4 HyperX 2666MHz RAM
Kingston 500 GB SSD
Energon EPS 750W PSU

I tried to install a graphics card earlier, but as I had some other issues I took it out and now only use the built-in graphics adapter.

After searching other threads I have checked:

• voltages measured with Fluke multimeter. All within 5%
• Removed BIOS battery and drained PSU by holding in power button.
• Removed RAM and put it in again
• Connected old PSU - same result.

I am really at a loss here and hope somebody can help me to figure this out. My current theory is that voltage sensor is busted, and if I could get into the BIOS settings to turn off surge protection there is a hope that it will start. But that is mainly because I can see no other option.

 

[alceryes]

It could be something not seated properly.
Go down to minimal boot - CPU, 1 stick RAM, KB/Mouse, and no drives or other devices. See if you can consistently get into BIOS.
If you can get to BIOS go to the environmental/temperature page and sit there for 10 mins and let us know what the temps are getting up to. Please list the CPU cooler being used.

 

[Nemesia]

Power Surge Detected.

remove all your components and turn on the pc outside the case, on a non conductive table, or piece of cardboard or motherboard box.
if it works it's because something is touching the motherboard.
Go down to minimal boot like said above by alceryes - CPU, 1 stick RAM, KB/Mouse, and no drives or other devices. See if you can consistently get into BIOS.

 

[KKH12345]

Just tried to remove SSD and one stick of RAM and got same result.

Will try to start it on a cardboard plate.

Cooler: Arctic Freezer 34 CO

When I managed to start it I let it run for a while and temperature never went above 25 degrees Celcius.

 

[KKH12345]

Took out the motherboard and put it on a cardboard plate. Unplugged all casing connections except power switch. Only thing connected was screen (DVI) mouse, KB and cooler. Same result. Tried to unplug cooler fan. Same result.

 

[Zerk2012]

Crappy power supply try it with a better one if you can borrow or have one.
(cheap and 2 year warranty 552 watts not 750 on the 12 volt rail it's what a model from 11 years ago)

Meters can miss spikes or even complete intermittent lack of voltage because of the reaction time, been using one for over 20 years.

EDIT Asus boards have been known to give false positives on that it can be turned off in BIOS at your own risk.

 

[Windows22]

Crappy power supply try it with a better one if you can borrow or have one.
(cheap and 2 year warranty 552 watts not 750 on the 12 volt rail it's what a model from 11 years ago)

Meters can miss spikes or even complete intermittent lack of voltage because of the reaction time, been using one for over 20 years.

EDIT Asus boards have been known to give false positives on that it can be turned off in BIOS at your own risk.

I agree with this solution; seems to be plausible since BIOS did not help and just out of curiosity, are there other ways to determine if voltage or even RAM presents and issue with the CPU?

 

[KKH12345]

Thanks for your advice!

I will try to get hold of another power supply