Hi,

I recently ordered a GTX 570 on amazon. Knowing my old 400W PSU wouldn't suffice, I also ordered a 1000W PSU (I don't need 1000W now, but I'm going to need it.) However, the new PSU arrived broken. Now I have a GTX 570 and only a 400W PSU. I need a solution until a new or repaired PSU arrives.

First I tried just using my old PSU, which surprisingly worked. But the performance is not so much better than with my old 9600GT (but at least it is better!). I'm sure it would be faster if the graphics card had the power it needs.

Now I tried using an other PSU and connecting the graphics card to it, while I keep the rest of my computer to my normal PSU. I put a cable connecting the green pin to a black pin of the main-ATX-cable of the PSU to turn it on. If I check with an old harddisk I can confirm that there is really power on the connectors.

But when I try to turn my computer on, it won't start. I hear some "clack" (from the internal speaker?) about once a second. Then after a while it beeps repeatedly, propably to inform me that something is wrong...

So does anyone know more about this topic? Can you tell me why the computer won't start when the graphics card is powerd with an other PSU and what I can do to make it work?