That's well known problem with Z77 FTW and different other motherboards with Intel HD4000.
You will find all over net people without signal on monitor, no signal after Windows 7 Loading, no signal or post at all/nothing...
What is problem I don't know...I lived with problem 2 weeks without solution I need HD4000 for simple games because HD5870 overheating... but I had same issue with no signal...
Later I bought eVGA GTX580 just for period until 780.
OK I would bought GTX580 and without signal problem as backup card but I will never know what cause that.
I only know people here had signal with IB and Z77 FTW but problems when they try to OC CPU and of course guys without signal only black screen like me and you...
EVGA say we need to use Active adapters...
Maybe is solution in cable only mini display to HDMI or mini display to DVI without adapters.
I had CPU temp on LED too, and I hear Windows boot but no picture.
And I could turn Internal GPU but only when dedicate card is connected. And that with tweaking little.
In Device Manager I see than Intel HD4000 + dedicate card but only when cable is connected on main GPU.
post edited by Vlada011 - 2013/09/17 07:43:36