I got a 1u atx power supply from a friend of mine that I want to use to test some fans and things. I try to short the grren and a black wire to use it, plug it in and nothing. I'm pretty sure it works. but is there a special way to do this when there is no switch? thanks.
It should just be a matter of connecting the green and black, but occasionally some PSUs use grey instead of green. I think it's pin 12. Code: __ OOO#OOOOOO OOOOOOOOOO That is looking into the connector with the underscores as the clip. The pin marked with a # is the one you want to ground to run the PSU.
i did that. then since there was no "on off" switch I just plugged the power supply in and nothing happened.
No, having no power switch on the back just means that the psu is constantly live, ready to be turned on (by the motherboard) like a PSU with a switch set to on. When you tried this did you have a load on the PSU? e.g. a fan (not the PSUs own fan), if not then try again...
Yeah, try as Kermet said with a load on. I forgot about that, most PSUs need a load to stabilise voltages or work at all.
Don't you need more than one fan? The fan in the PSU is also connected to the 12V channel and ground, so technically, you always have a small load on the PSU, thus I wonder if connecting only one (two) fans is enough to get the PSU running.
Always has done in my case, done it quite a few times too... EDIT: An ATX PSU really needs about 20W (perhaps more for higher W PSUs) load to perform with proper power regulation, though can start with less.
ugh... I got it my dumb friend must of been messing with it he had the back set to 230vac doh I should of thought of that in the first place thanks again guys.
