how do u make a psu turn on without connecting it to the mobo???i have a bunch laying around and i wanna use one for testing fans and such...

I'm assuming your talking about an ATX PSU. Easy done, green wire connected to any black wire via paperclip or wire, then flip on switch on back of PSU.

haha thats kinda funny u answer 2 of my posts in a row first....haha thanx b-boy

No Problem, you asked questions that I know alot about.

In living color.....

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Just don't switch it on without a load. Plug a fan into a molex connector or something.

Whynot Wixx?

Well for one they generally wont come on unless there is a load present.. if there is a damage causing reason I am not aware of it...

Sorry, I guess I should have clarified that first. Most voltage regulators require a minimum load, otherwise they can self-oscilate. I think the majority of power supplies have a minimum load resistor in them, but since we're "using the product in a manner inconsistent with its labeling" it's always better to be safe than sorry.

Good point that I failed to mention Wixx...good to see you posting man, been awhile.

I see... there is a reason why he has the title of Modd-God.

*bows down* to the Modd-God

"Just don't switch it on without a load. Plug a fan into a molex connector or something."
From http://repairfaq.org/sam/smpsfaq.htm :
"CAUTION: I have seen one case where an ATX supply actually blew up without a load using this "hot wire" technique. I don't know if there was already a problem with the unit or it really absolutely required a load. But almost immediately after grounding the green wire, multiple electrolytic caps on the secondary side exploded and spilled their guts, one of the MOSFETS shorted, and then the power fuse blew. It may be that the designers of this supply in their infinite wisdom assumed that since power is enabled via the mainboard, there would never be a circumstance where there wouldn't be at this that as a load!"

so what would happen if you did switch it on without a load? because i did that and it was on for a few seconds and then just stoped working. did it die?

"so what would happen if you did switch it on without a load? because i did that and it was on for a few seconds and then just stoped working. did it die?"
Some PSUs would work without a load, others simply go pop and burn out.
I find that a 5 ohm, 10w resistor on the 5v line is enough load to allow an ATX PSU to work.

they make a noise when they die?

i think it woujld either fry, like u would smell some burnin stuff from the indside or just not worik.....i have had psu's do both before