Z68A-GD80 (B3) ... needed new CMOS battery ... but won't boot after replaced

Jahf

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Oct 20, 2011
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So this is a rather old board at this point. I repurposed it from a desktop to a NAS+Docker server (Unraid) a few months back.

Symptom: after a reboot the system fails to power up. Power LED button on motherboard lights up green as expected. But, when power button is pressed to turn on the system BRIEFLY takes power then all goes back to powered off state (including the LED staying lit). CPU cooler spins not even a 1/5th rotation before the system dies.

Note: System wasn't moved, reconfigured, or anything else at this point. I was just rebooting to flush the NAS as it had been running a long time and had a stuck Docker container.

I've had it long enough that this is the second time I've needed to replace the CR2032 battery for the CMOS.

This time I did the following:

  • Powered off via PSU kill switch
  • Removed battery, waited 5 minutes
  • Tested CMOS battery in a remote control that uses the same battery type, definitely dead battery
  • Placed new known-charged battery (tested in remote control)
  • Flipped the PSU switch back to powered
However at this point, pressing the power button does the same thing it did with the dead battery.

Even though the PSU is new (purchased when I converted system to NAS, old PSU stayed in desktop) I figured I'd better check. So I plugged the PSU into a power tester and all levels are fine.

I flipped the PSU power kill switch again, changed the JBAT1 jumper to "clear" (pins 1 & 2) and then back to "keep" (pins 2 & 3). But that didn't help.

Any ideas on what I need to do to get things up and running again? I feel like I had this problem when I replaced the battery 4 or so years ago (which makes sense, it's an 8 year old system) but I can't remember what I had to do to get it to POST again after that.
 

Jahf

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Joined
Oct 20, 2011
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I'm chalking this up to the PSU.

Motherboard powers up fine as long as no IDE/SATA cables are plugged in. With 1 specific cable plugged into the PSU (but no drives attached) the board won't power up. Removing that cable but keeping the other drive cable worked. For a few minutes. But now just having that one plugged in (with or without a drive attached) now prevents the board from staying powered up.

My guess would be one of the 12v rails failed. But. It's a single rail PSU. So ... I'm at a loss. I guess the cables could be fried but that would be really odd as they were routed differently and neither is showing compromise.
 
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