Newly Built PC only outputs when connected to motherboard

[smush]

Hi
Built a new PC with specs:
Motherboard = Gigabyte Z170MX
GPU = MSI R9 390X
PSU = XFX Black Edition 850W Modular
CPU = Intel i7 6700K
RAM = 2x8GB DDR4
DVDRW
HDD 4TB
SSD 250GB

Connected it all up to PSU, put HDMI into GPU turned PC on - the GPU MSI logo lights up but monitor is blank I unplug the HDMI and monitor reads "cable unplugged" I plug it into the motherboard HDMI port and monitor works - I can access BIOS etc. Can anyone help? Thanks

 

[Grimwinder]

Normally these days motherboards will automatically disable the onboard graphics when a video card is installed, but check in your BIOS and Windows to see if the video card is being detected. Also, make certain you have the proper power plugs connected to the card and try the card in a different PCI slot as well and try other types of cables than HDMI if you have cables and your monitor supports other ports.

 

[Guest]

Does your motherboard have an option to use PCI-E graphics only? If so, this option might need to be enabled.
Also, try re-seating the graphics card into its slot, as well as re-seating th 8-pin and/or 6-pin power cables.
If there is a VGA Bios reset switch on the graphics card, then reset that as well.

Let us know if you have any further questions.

 

[smush]

Normally these days motherboards will automatically disable the onboard graphics when a video card is installed, but check in your BIOS and Windows to see if the video card is being detected. Also, make certain you have the proper power plugs connected to the card and try the card in a different PCI slot as well and try other types of cables than HDMI if you have cables and your monitor supports other ports.

I don't know where GPU would be in BIOS, I had a look earlier and couldn't see it the GPU has 6 pin and 8 pin pcie I used the 8 pin using a 6+2 pin connector the 6 pin port in blocked by case materials. The other PCIe slots on motherboard aren't pcie 3.0 x16) though. I don't yet have Windows installed yet either - I shouldn't need to install Windows first then the GPU drivers, right?

 

[Derza10]

Normally these days motherboards will automatically disable the onboard graphics when a video card is installed, but check in your BIOS and Windows to see if the video card is being detected. Also, make certain you have the proper power plugs connected to the card and try the card in a different PCI slot as well and try other types of cables than HDMI if you have cables and your monitor supports other ports.

I don't know where GPU would be in BIOS, I had a look earlier and couldn't see it the GPU has 6 pin and 8 pin pcie I used the 8 pin using a 6+2 pin connector the 6 pin port in blocked by case materials. The other PCIe slots on motherboard aren't pcie 3.0 x16) though. I don't yet have Windows installed yet either - I shouldn't need to install Windows first then the GPU drivers, right?

You have to connect both the 8 pin AND 6 pin to the GPU... If i'm reading what you said correctly it sounds as if you only used the 8 pin?

 

[Grimwinder]

You should install Windows. And are you saying the 6 pin power port is "blocked" do you mean you only plugged in the 8? If so you need both. And the PCI slot version (x16, x8, x4 etc) won't matter to see if the card works elsewhere in order to make sure the PCI slot isn't the issue.

 

[Grimwinder]

From your mobo manual, you'll find this setting in BIOS under Peripherals-

& Initial Display Output
Specifies the first initiation of the monitor display fromthe installed PCI Express graphics card or the onboard
graphics.
IGFX Sets the onboard graphics as the first display.
PCIe 1 Slot Sets the graphics card on the PCIEX16 slot as the first display. (Default)
PCIe 2 Slot Sets the graphics card on the PCIEX8 slot as the first display.
PCIe 3 Slot Sets the graphics card on the PCIEX4 slot as the first display