Screen goes in standby after Apple logo after OS X 10.9.3 update

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Apr 21, 2013
iMac Mid 2011
Intel Core i7 2600S
AMD Radeon HD 6770M
  1. iMac
Classic Mac
Mobile Phone
  1. iOS
I've just built an Hackintosh with these specs:
i5 4670
Gigabyte GA-Z87X-D3H
Inno3D GTX 760 Herculez 2000s
SSD 840 Evo (OS X)+Western Digital WD10EZEX (Win8.1 Pro+shared data)

The installation of Mavericks 10.9.2 (in the ssd) goes fine, and it works after the audio driver installaton. But if I install 10.9.3 the screen goes in standby after the Apple logo (it's a vga screen connected to the graphics card with a dvi-vga adapter). I've also tried to boot with the Intel HD 4600, but there's the same problem. Why does it happen????

Sorry for my English, but I'm Italian.

When I change the computer model from Mac Pro 3.1 to others the Hackintosh will show a Kernel panic.
Oh wow,
I have the exact same MB & Video Card and the exact same problem.
The only difference is that my monitor is connected via dual-dvi link.

Tried to update yesterday but ended up reinstalling 10.9.2 back.
The only thing I would like to add is that even though display is not working I was able to type my password and press enter and sounded like the system was working just fine.

Would really appreciate any help. Thanks.
had the same issue today. and the solution was easy: deactivate the onboard graphic card in the motherboard's bios settings.
sometimes adding the boot flag dart=0 will solve this problem and will still allow you to use the onboard graphics along side of a graphics card if booting also with IGPEnabler=Yes
Having the same issue, can't seem to find the Disable option for the onboard gfx.
Mother board - Gigabyte ga-z87-hd3
Just an update, plugged the hackintosh into the HDMI / TV and it works.
Same hardware for me, I was having the same issue
I solved switching "internal graphics" to Disabled
Try it
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