If the OP had the card overclocked without enough voltage, that could have been the cause.

Does anyone have anything to contribute, or are you all going to mock me for throwing out real numbers to try and solve this problem that the OP had?

upped by .5v

If you took that away, would it cause the black screen? I am not asking you to do it!
Thank you for replying to my question; it means a lot to me!

didnt matter that psu had no head room meaning it was wortless why its rec to get 650+ for single 570/6970 or 850 for crfx/sli

non the less new psu his problem solved obv problem was obv

This post was edited by southpark247 on Nov 15 2011 02:12am

It does matter if the voltage was changed after adding a atronger PSU, not before. That PSU had headroom, from the numbers that I showed.

The following link shows power draw of a DirectCU II version at stock and with a 101MHz overclock and an additional .063 voltage that went up by 60 watts:
http://www.geeks3d.com/20110217/asus-geforce-gtx-570-directcu-ii-review-test-overclocking/6/

So, the OP's card should have had headroom, and if you note the VDDC used by the link's card, it was raised from .95 to 1.013, so it must have been unstable without the raised VDDC, which I believe the OP's card was, too.

If the OP wants to test this, he can use the same VDDC that he was experiencing the black screens with but with that 1000 watts PSU, and I bet that that black screen would occur, despite having adequate power.

This post was edited by L4d on Nov 15 2011 05:55am

I tried adding .5 with the other PSU, and the screen turned this orangeish color for a second, and then blackscreened

Is this thread srs. LOL

Wow.

570 and 2600k on a 550 watt psu.. who helped you pick out parts? LOL.

I do not see where the power being consumed. Is your CPU overclocked, too?
Is the 550 watts PSU old?
The following link shows no one having a problem with a GTX 570, i5-2500k, and a slightly weaker PSU:
http://www.mmo-champion.com/threads/1009891-BF3-D3-Oriented-PC-Build-Questions?p=13926116
The following link shows the same thing:
http://www.tomshardware.com/forum/319197-31-challenge-high-gaming-build-norwegian-edition

I bet that that CPU of the OP's is overclocked, so that would top out that PSU, but it was never stated that either were overclocked in the original post.

This post was edited by L4d on Nov 15 2011 01:30pm

I would not bother with calculating any rails other than the 12 volts. 45 amperes/540 watts are what we have to go by.
140 watts for the CPU.
Let us assume 360 watts for the GPU because of the Geeks3D link's stating of a 60 watts increase from stock clocks, which was the maximum stable overclock in Furmark.
We are at 500 watts, out of 540 watts total that are usable for the HDD's, optical drive's, and fans' power. There should be enough power, but I would not recommend using a PSU that would be taxed so much, so it could have degraded, depending on how long the OP had been using it.

I am done beating the dead horse...

This post was edited by L4d on Nov 15 2011 02:36pm

His card was factory OC, it most likely would have worked. But don't worry, your word is gods word, just like Ghot