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Odd PSU quirks

L

LEDominator

Senior member
Ok, I have encountered something very odd. I upgraded the BIOS on my motherboard and now when I shut down the computer, everything goes great, except the power supply will no longer shut itself off. I thought it might be windows or perhaps some settings in the bios, but all to no avail. It still shuts down the os fine but keeps the case power on. Any ideas on how I can fix this?
 
You do realize that there are two steps to flashing a BIOS, don't you? The first step is the actual flashing. The second step is resetting the BIOS. For most new motherboards, a "soft" reset works fine. A soft reset is going into the BIOS, and selecting the Load Optimized Defauts (also called Load Default Settings in some BIOS's), then saving the changes, then going back to the BIOS and changing anything you had changed beforehand back to where you had it.

If your motherboard is older (you never said), sometimes you have to do a "hard" reset, which takes longer. That requires removing the power cord from the psu, holding down the power button for ~30 seconds (to discharge your capacitors), removing the battery, and moving the CMOS Reset jumper to the shorted position for 15 minutes or so.
 
I did that. I even tried the second method as well as clearing the CMOS. Same problem. If it helps, the motherboard is a foxconn (Winfast) 6150K8MA-8EKRS. I am using it in a media center PC configuration.
 
It`s not a PSU issue...it`s an OS issue or an issue with your bios....
The PSU will only shut down automatically if the computer/oS asks it too....

I would bet you iether didn`t flash your bios correctly or you possibly even downloadd the wrong bios...

Good Luck!!
 
Check the Power-good signal with a DMM. If there is no shut-off pulse, there may be a problem with your motherboard or BIOS flash.
 
Originally posted by: myocardia
You do realize that there are two steps to flashing a BIOS, don't you? The first step is the actual flashing. The second step is resetting the BIOS. For most new motherboards, a "soft" reset works fine. A soft reset is going into the BIOS, and selecting the Load Optimized Defauts (also called Load Default Settings in some BIOS's), then saving the changes, then going back to the BIOS and changing anything you had changed beforehand back to where you had it.

If your motherboard is older (you never said), sometimes you have to do a "hard" reset, which takes longer. That requires removing the power cord from the psu, holding down the power button for ~30 seconds (to discharge your capacitors), removing the battery, and moving the CMOS Reset jumper to the shorted position for 15 minutes or so.
Click to expand...

Actually, most boards just require you to move the cmos reset shunt over and press the power button and then move it back. The system probbaly will not turn on but it will reset the cmos
 
Actually, most boards just require you to move the cmos reset shunt over and press the power button and then move it back. The system probbaly will not turn on but it will reset the cmos
Click to expand...

This can be dangerous. Some motherboards will destroy themselves if the CMOS jumper is in the reset position and the powersupply is switched on while plugged in.

It's very rare, but I have seen it before on older motherboards.

Myocardia's procedure is the 100% correct method, assuming you don't have the manufacturer's manual handy to consult the specific procedure for your make/model of motherboard. Obviously if the manual you have specifies a different procedure, then use that.
 
remove the atx plug from the power supply.
Now jumper the green and black wire.
The supply should come on.
Now remove the jumper.
The supply should shut off.

If it doesn't do the above, the supply is bad.
 
Hey guys thanks for the advice! 😀 I ended up starting completely over. I reset the BIOS with the jumper to clear the CMOS and then re-flashed the most recent BIOS. It worked like a charm and everything works great! I tested the power supply too and everything checked out. I must have had a corrupted file originally or something. Either way, I appreciate the input! 😀
 
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