GIGABYTE x58a ud3r -GIGABYTE hd 5770 help

[gogugmg]

I can not install the system, each time after iBoot when inserted, the system enters the power off, fan speed and monitor their larger black, to mention that the same system goes GTS 250 video card installed, but fail to install or boot partition where you have installed GTS 250 video card:
PLS i need help to solve this problem:
I have this configuration

CPU CORE i7 i7-930 2800/4.8GT/8M BOX LGA1366
MB x58a ud3r
VC Gigabyte Radeon HD5770 Ultra Durable 1GB DDR5 128-bit
SSD SSD Intel 40GB SATA-II X25-V gen. 2 retai-

With this GTS 250 no problem just with HD 5770

THX and sry 4 my engl ,google translate:

 

[immapc]

The ATI requires GraphicsEnabler=No
boot with iBoot and then start multibeast.
If your system was stable when you changed the Vid Card then just check the System Utils for rewrite privledges etc. And then Click Kext for Vervet and a 32 bit GraphicsEnabler=No profile.

Should work no prob from there on reboot.

Do the opposite if switching back to NVidia and use NVEnabler Kext and GraphicsEnabler=Yes for NVidia.