I'm copying this a previous post upon request from Kevin_Intel. Still having the same problems. I have an I7-3770 on a Gigabyte GA-Z68MA-D2H-B3 with Windows 8.1 OS, 16GB DDR3. I've been using an NVIDIA GeForce 7300 LE because I wanted an S-video option. Now I want to use the onboard HDMI and couldn't download the latest driver. As is, the HDMI gives me a blank a screen. If I boot up with DVI or VGA, everything goes blank when I plug in HDMI. I've tried every method of updating the video driver. I've tried using the update option in the Device Manger. I've tried downloading and running the EXE file. I've downloaded the ZIP file and tried to install manually. Every method crashed the system.
I tried the option - Let me pick from a list of device drivers on my computer. I cannot install driver versions 10.18.10.3316 [10/1/2013], 10.18.10.3412 [1/29/2014], 10.18.10.3496 [3/12/2014], no matter what method I use. So I uninstalled HD 4000 from the device manager and when the computer restarted, HD 4000 returned with the latest driver, 10.18.10.3496 [3/12/2014]
Now the problem is worse. The problem was HDMI. Now VGA, DVI and HDMI all crash the video. If I boot up with a monitor plugged into the GeForce 7400 LE it works until I try to plug into any onboard video. Then all screens go black except I can see the mouse cursor. If I unplug from the onboard video, I'm back at the login screen.