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Strange motherboard issue

Posted: Wed Jan 26, 2011 11:07 am
by lobf
So I'm fixing a friend's mediacenter PC who's motherboard crapped out. I buy him a new mobo of the same type, and I install it without any real issues. Except the front panel connectors are in one of those thick black things that keeps them all together so they can all be plugged into the mobo at once. Well that black thing was built for the other mobo, and the pins don't line up right, so I pull the pins out of the "pin holder" thing and go to plug them in individually.

Here's the weird part. I plugged them into the on/off pins on the motherboard, but nothing happens. I tried switching which pins they were connected to, nothing happens.

However, I accidentally brushed the pins on the mobo with the wires for the power button and the fans turned on (making a lot of noise, actually now that I think about it.) I didn't plug the monitor in to see if everything was actualy running, but I think it was.

Can anyone figure out what kind of issue that is? Or where I should go to find out?

It's a Biostar A780L, if that makes a difference. Thanks for your help folks!

Re: Strange motherboard issue

Posted: Sat Feb 12, 2011 10:34 am
by Major_A
I'm assuming the original board came from an OEM manufacturer (i.e. Dell, HP, Gateway, etc...). They are the only people to use the "all-in-one" front panel plug. Worst case scenario you can "rig" up a power and reset switch. Go to a local mom and pop shop and ask for a power switch. I picked up 3 or 4 form a local shop for $1.

When you heard the machine come on you probably shorted the power pins. Since that's what essentially the power switch does, but in a more elegant way.

Re: Strange motherboard issue

Posted: Sat Feb 12, 2011 3:01 pm
by skier
Major_A wrote:I'm assuming the original board came from an OEM manufacturer (i.e. Dell, HP, Gateway, etc...). They are the only people to use the "all-in-one" front panel plug. Worst case scenario you can "rig" up a power and reset switch. Go to a local mom and pop shop and ask for a power switch. I picked up 3 or 4 form a local shop for $1.

When you heard the machine come on you probably shorted the power pins. Since that's what essentially the power switch does, but in a more elegant way.
certainly what was done.

this is my power button for my on-desk setup
IMG_0125.JPG
IMG_0125.JPG (86.07 KiB) Viewed 4596 times
was originally a dead reset button, but i chopped off the button part and stripped the wires because it is a lot easier than always starting it with a screwdriver

the only thing that buttons do is create a short between a specific pair or group of wires/contacts, so figure out what pins are for the PW and RES (Power/Reset) and replace the buttons, or you can just splice little headers to the end of the button wires like from LEDS or even from an in-chassis speaker


also, i accidentally shut off my computer while trying to take a picture haha