PSU must be cut off to successfully boot after shutting down

[JonBeam]

I've recently purchased an open box motherboard and am trying to figure out if this is something I can resolve, or if it's an issue with the motherboard itself.

If I shut the computer down, then try to turn it back on either immediately or much later, the computer will power on but will not successfully boot. There's no startup beep and no power to peripherals. I have to flip the PSU switch then wait ~10 seconds to start the computer up.

Computer seems to be running fine otherwise. If I never turn it off, I never have problems. If I simply reset the computer, it resets just fine.

This is mostly a new computer, but the PSU is not new and was working reliably with my last motherboard just a few days ago (P8H67-M LE, I believe).

Current specifications:

- Maximus VIII Ranger (open box from newegg)
- i7 6700k
- Evga 1000w supernova (~1-2 years old)
- 32gb (2x16gb) TridentZ RAM
- Evga 1060 ftw+

So far I've tried to turn off fast boot, but this does not appear to have resolved the issue.

 

[Dunlop0078]

Is the battery on the motherboard missing or dead? Is the clock on the desktop wrong after you unplug the computer and turn it back on?

And doesn't that mobo have a digital readout for error codes? Is it showing any codes?

 

[helpstar]

Did you reinstall windows after the replacement of the hardware?

BIOS up to date ? don´t flash in windows, use the integrated BIOS tool ezflash.

reset BIOS

 

[JonBeam]

I believe the Q-code is 00 (not used); I'll confirm this when I get home. The clock is correct; there's no evidence I've seen to indicate that it's the battery. BIOS is up to date. I had some problems with the RAM initially and had to update the BIOS for compatibility.

Edit: The Q-code is 00 (not used). It does not cycle through numbers rapidly on startup like it does on a normal boot. It also does not wake up from sleep if I tell it to go to sleep.

 

[Tradesman1]

Make sure latest BIOS? Check for latest mobo drivers? GPU drivers? A clean install of the OS? Do you have access to a different PSU you could try? Yours should be fine, but can't rule out one failing

 

[helpstar]

check cpu socket pins of the motherboard, if some are bent in the wrong direction

 

[JonBeam]

As mentioned, this was an open box motherboard. After closer inspection, it turns out the previous owner moved the LN2 jumper to the non-default "enabled" position. Switching this jumper back to disabled resolved the problem.

The computer will now shut down and reboot just fine, and will recover from sleep mode successfully.

 

[Tradesman1]

Glad all is well

 

[helpstar]

which jumper was it exactly?

 

[JonBeam]

which jumper was it exactly?

The LN2 jumper. It's to the immediate right of PCIEX4_3 (the bottom expansion slot).

 

[helpstar]

thanks for the feedback