Question HDMI doesn't work with Windows 10 Gigabyte new build

[oatmeal769]

Recent upgrade from Win7 to Win10. Love the under the hood stuff. But the interface and all the glitches are maddening. Case in point.

New Win10 build v. 1809
GIGABYTE Z390 AORUS Pro WiFi
Intel i7 8700K
Corsair 16GB (2x8) DDR4 3000MHz
Gigabyte Nvidia 1660Ti
Corsair RM650x (2018) PSU
Dual 4K monitors

All new hardware and build. Set up and installed Win10 before the video card arrived. I used one monitor via the onboard HDMI port until I received and installed the new card. (Gigabyte/Nvidia 1660 Ti)
New build worked while I waited for the card, using the MoBo HDMI port and my monitor. After install of the new card, no signal from either the MoBo port or the video card HDMI port.


Display ports on supplying both my monitors work fine with the new PCI Nvidia card. However, the HDMI port supplying my television does not. All I get is a blank black screen, with no signal other than black. My television does, however, show this black screen, instead of the "No Signal" message I'd get if nothing were connected. When connected to a monitor, it gets some kind of signal. - Most times, I can get the windows splash screen, then all goes black. My television still works with my Blu-Ray player and the same cables with HDMI.

HDMI onboard port does NOT work now that the Nvidia card is installed, regardless of BIOS detection settings.

I've done the basic suggested fixes in Win 10 that I've found searching online, like re-installing drivers, attempting to identify, or detect a display, or set up multiple monitors in 'Settings.'

Other things I've done:

Tried switching from onboard video to PCI and back for the first video detected in BIOS.
Tried a different cable, both to my monitors and to TV = same result
Tried two different monitors with four different cables.
Display ports work normally with or without HDMI connected.
Tried unplugging all but HDMI cable.
Re-installed Nvidia driver
Updated BIOS and Chipset

A couple of times, an "unknown device on PCI" was shown in the Device Manager. Deleting it and trying to get it to re-recognize and install, or finding a driver for the device resulted in nothing.

Hope someone can help, this has me buffaloed.

 

[helpstar]

Which television are you using?
Did you try different HDMI ports on this TV? Source selected correctly?
Firmware of the TV is up to date?

restart windows

unplug all but the HDMI to your TV, load default settings in BIOS, reboot

which nvidia driver version is installed?

 

[oatmeal769]

It turned out to be the driver.
I had recently built the PC, a guess is that I possibly downloaded the wrong one, but Nvidia's usually fine about compatibility when you let it search. Another guess might be that I set the PC up only using my two monitor displays. I didn't have any HDMI plugged into the GPU, and added in the HDMI later. There may have been a glitch in how the driver set itself up initially. Even though the PC saw the HDMI and didn't show a problem with the driver, the driver didn't turn on the video send - or something.

I performed a complete uninstall and searched through Registry, Users Program Files, etc. to clean out remnants. Then downloaded and re-installed. It worked.


Thanks for replying