I have a 250watts power supplies and i have randoms reboots when i overclock my processor too much, i want to know how to link 2 PSU to get more POWER!!! (ATX) I can find used ones for cheap!

Not mean't to be done. Without an electrician's qualifications, you should not even begin to bother. Just buy a 500 watt, and save yuorself possible electric shock, and even a house fire.

Asked and answered. "I can find used ones for cheap!" Use them for an old machine. Follow above advice for new stuff.

There is no need to 'link' them. Plug the motherboard into one and the drives into the other.

Fred, if you don't link them, the second PSU won't turn on when you push the start button. As a matter of fact, I linked 2 425 watt PSUs together about 4 weeks ago, so far no problems. I don't know if this is the proper way, but these are the connections I used: connect at least one common from each PSU together (I connected all matching from each). Then connect Power OK (pin 8) from each, and then Power On (pin 14) from each. Now when I push just one power button, both PSUs power up. I am running 4 HDs and the mobo on one PSU and 2 optical drives, 2 HDs, 1 floppy, and several fans on the other. Why? Because I can (or I wanted to see if I could). One PSU did not give me the needed 12V watts for my purposes. Raphael, check your e-mail, as I sent a file with a pin diagram for ATX PSU. BTW, I am an eletrician by trade (it does help a little). Good luck.

I've seen cheap adapters for sale that supposedly allow a power supply turn on that isn't connected to a motherboard. www.cyberguys.com has them.

If you look at the side of your power supply it tells you which wires connect.... BTW it's the green and the black on most of them. But linking them together is a really bad idea the capacitors in the power supply could explode ... however I am not sure about what the other guy said about one for the motherboard and one for the drives that sounds feasible