Powering up an ATX board? ... Crack rack gurus

[JHutch]

OK, guys, I recently upgraded my P3-450 to a Thunderbird 1GHz. Now I have a wonderful little P3-450 sitting next to my desk with no case. I have a spare ATX power supply. However, with the ATX, it won't power up the board. If I jumper the pins that normally connect to the case power switch together, the board tries to power up, but shuts back down almost immediately.

Is there a trick here I am missing? I'd really like to get this working with KLinux without having to buy a new cheap case.

JHutch

 

[Joe O]

Check your setup for shorts, cables in backwards, etc. If the floppy and/or IDE cables are backwards, it could behave like that. I also just saw it happen with a defective CPU fan.

By the way, I power up my caseless Dueleron by shorting the two power pins with a screwdriver. Hey, it works.

 

[Sinner]

Jumpering is not the answer! Head over to Radio Hack and pick up a momentary switch.

While using a jumper you must immediately disconnect it, or short the connection with a screw driver. Myself I use momentary switches(actually its a button, but I think the package calls it a switch).

 

[Kilowatt]

Yeap, momentary switches are the way to go, and their cheap at Radio Shack.
A couple of bucks at most for 4.

What I did, was to cut some CDRom audio cables in half, and solder a momentary switch to the two wires that are together.
The CDRom connection (plug) will fit right on the pins for the power switch.
I yanked out the other wire(s) out of the plug that wern't needed, so they wouldn't contact anything.

I did basicly the same thing for the Power LEDs, using Radio Shacks cheap 2v LEDs, also a couple of bucks for 4.

 

[networkman]

The reset switch works well as a momentary switch too.

 

[Mandrill]

I used the screw driver method. Didn't cost me anything

 

[Athlex]

I'm also using momentary switches for my racks. One system I built had that same sympton of killing its power after a short while. Turned out it was a loose fan connection to the motherboard.
atx

 

[Sukhoi]

I'll take the P3-450 if you can't get it working.

 

[JHutch]

OK, great! Now I understand what is happening!

(My experience with crack rack nodes up to this point have been AT boards, which work a little differently...)

I'll probably just use the screwdriver trick for now! (It'll get it running right away instead of waiting until I track down parts!)

Thanks, guys! You're the best!

JHutch

 

[JHutch]

Oh, yeah, and Sukhoi ... I think I'll keep it for now!

JHutch

 

[JimMc]

I used old case speaker connectors, they're already 2 pin. Plugged it on the power pins and stripped the ends of the wire. Just tapping the bare wires boots, tapping again powers it off.

 

[blade47]

I powered mine up with a screwdriver the first time then set the bios to autopower on. Now I just turn the juice on & away it goes.

BTW I also had the same problem you are. It turned out to be the PS.

 

[cory]

i did the same thing blade_47 did and is better if you have
a whole bunch that you want to turn on.