ATX-power supply question - SOLVED!

[KifArU]

For a (very small) crackrack I've placed the components on a piece of wood instead of a case. But it won't boot. Do I have to attach the p/s case to the mainboard? (what the metal case would do normally)
Or is there another trick to make this work?


First of all: THANKS GUYS, problem solved!

And the problem was.................. The keyboard! Maybe I've dropped it or something, but the keyboard made the whole system lock up. Last time I used it, it was good, so I didn't suspect this. I unplugged everything, even the floppy drive, but the cpu-fan wouldn't spin with the keyboard and mouse connected. So I disconnected those too and then it would boot, so plugged everything in, first video, then the keyboard and it locked.

Russmanuk, your tip helped a lot. After testing with the green and black wire, the fan worked OK, then I knew it wasn't the p/s.


Thijs

 

[ElFenix]

it should be able to boot that way... unless you've got conductive wood... which would be, well, weird. you've shorted the power switch leads, right?

 

[KifArU]

Yes, I attached a wire to the pins on the mainboard. I can short those, like a power switch.

Thijs

 

[ElFenix]

should boot. you have ram and processor and vid card in there?

 

[russmanuk]

You have to short the pins & release. The power switch on an ATX pc case is a momentary switch that just connects for a short time.
Does the mb led come on when the psu's connected? You can test the psu by shorting the green wire to earth. The psu should turn itself on (fan starts spinning).

Russman

 

[KifArU]

Yesterday I did some more testing and it seems like the p/s isn't good. I attached an extra fan to a 4-pin connector and when I connect the p/s to the m/b, the cpu-fan and the extra fan spin for a split second and stops again. The keyboard lights go on and off, then only the power-led on the keyboard stays on.
When I test the p/s (I connected the purple and black wire) it does the same. The fan makes 1 or 2 rounds and then stops.
Could this just be a bad power supply? Because when I took it out of my computer it was working well, I just upgraded to 300 W. After that it was on a shelf for about a year.

Thijs

 

[ElFenix]

i wouldn't think a PS could go bad just sitting on the shelf, but you never know. you could plug it into your computer's mobo and use the case switch to power it on, if you can get to the PS connector easily.

 

[Mobster]

Maybe it's your power-good signal that's incorrect?

 

[KifArU]

Do you mean with the testing? Because I have used this m/b with this p/s before. Than upgraded the p/s to 300 W, and now I upgraded the m/b, so I have the "old" m/b and p/s left over and I'm building a system with those.

Thijs