GA-X38-DQ6 double post after disconnected from power.

[rossb]

I always disconnect power to my PSU by turning off my power manager when I am done with my PC for the day. The first time I boot the PC after re-applying power to the PSU the PC will boot for a second, sound a post beep, turn off for a second, turn on a second time, sound a post beep for a second time, and then boot normally.

Any subsequent cold boots only post once as long as I do not disconnect power to my PSU. Why is my motherboard double posting after disconnecting and re-applying power to the PSU?

My X38-DQ6 also leaves my optical mouse light on when I turn off the PC if power is still available at the PSU.

 

[drysocks]

+5v is present even when "off"
I can't find the link to power supply operation at the moment that explains this and the yellow on/off wire.
Is the motherboard battery installed?

 

[Scotteq]

For sure, P35 chipsets double boot after Bios changes. I don't know about X38, but I'm inclined to think Intel would do them the same way since they were created back to back. So perhaps the battery on your mobo is a little low and when you re-apply power from the PSU it thinks something changed? Or perhaps the loss of 5v from when your PSU is fully off is having that effect.

 

[rossb]

The mobo battery is installed and I do not lose my BIOS settings when I power off my power manager. A co-worker just built a GA-P35-DS3L and his mobo does not do this.

 

[drysocks]

Just got to ask ...
Your "power manager", does it have a pass-through (always on) AC connection that the pc is connected too?
Is the battery in upsidedown? (I never took notice if this could be done)

 

[rossb]

My power manager does not have an always on socket. I plugged my PC directly into wall current (no power manager) and used the hard switch on the back of the PSU to turn it completely off. When I turned the PSU back on and hit the power button on my PC the mobo posted, turned off, turned back on a second later, posted again, and then booted. All subsequent cold boots only posted once (normally) as long as I did not remove AC power from the PSU. I also tried letting the PC sit for 5 minutes with the PSU getting AC power before attempting to do the first cold boot after a power loss. It still double posted.

I did not check the battery but it has to be inserted properly. I am not losing my BIOS tweaks.

 

[rossb]

I just tested my X38 and I noticed that the double post after being disconnected from AC power only occurs when I overclock my Q6600. It does not happen when I run the stock CPU FSB Frequency and Memory Multiplier.

When I run the stock clocks it only posts once and boots right up after being reconnected to AC power. I think Scotteq was right, it appears to be updating the BIOS when I cold boot after losing AC power while overclocking my CPU.