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Odd (PSU?) Behavior

P

psilence

Limp Gawd
Joined
Jun 1, 2009
Messages
167
Hello

This is occurring with my sig rig. Every time I unplug the machine from the wall and plug it back in, it does something very odd. I go to turn it on and it will turn on, immediately shut off as if there was a short, and then 3-5 seconds later boot up just fine. This is with just one push of the power button on the front of the case.

Is this a PSU issue? Or a mobo issue? It's an Antec 300 case. I'm not really worried, because everything runs just fine and it only ever does it if it's been unplugged from the wall. I'm just curious.

Thanks for any help.

-p
 
Look for a bios setting (usually under the Power Management section) named something like "AC Back Function". It determines what the machine does on loss of AC power at the wall. One option is that the machine stays off, another is the machine automatically reboots when power is restored. It appears that on the automatic reboot, the machine is doing a reset due to other settings in the bios and then acts normally.

If you change that setting it should do nothing when plugged back in and require you to hit the power button to start up. It still might do one quick reset on power up with the button. I say "should" as sometimes in bios revisions this functionality gets messed up. Anyway I am fairly certain that this setting ,whatever they are now naming it, is what is causing what you are seeing.
 
BillParrish said:
Look for a bios setting (usually under the Power Management section) named something like "AC Back Function". It determines what the machine does on loss of AC power at the wall. One option is that the machine stays off, another is the machine automatically reboots when power is restored. It appears that on the automatic reboot, the machine is doing a reset due to other settings in the bios and then acts normally.

If you change that setting it should do nothing when plugged back in and require you to hit the power button to start up. It still might do one quick reset on power up with the button. I say "should" as sometimes in bios revisions this functionality gets messed up. Anyway I am fairly certain that this setting ,whatever they are now naming it, is what is causing what you are seeing.
Click to expand...

Thanks Bill! That exact setting was in the bios and it now performs as expected.
 
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