Intel Motherboards : Help! No onboard display output from H170M-ITX/ac

I recently purchased a H170M-ITX/ac mini-itx board pairing it with a G4400 processor and I'm getting no display output from the onboard DVI and HDMI ports. I've already had the board replaced twice, but still nothing. The only way i can get a display out is by installing a PCI-Express graphics card. This is a brand new build and I cant seem to figure whats going wrong. I can't be receiving back-back faulty boards from Asrock. Can it be a problem with the processor?

Or should i just switch brands?

Any pointers would be appreciated.

Thanks