No HDMI signal from MoBo

[EpicSurvivor]

So my GPU is coming back from RMA Monday. My HDD is in RMA but gets here today. I wanted to enable my on board Graphics to install windows on it when HDD gets here. But I am getting no HDMI signal message on screen.

I can wait for GPU Monday and use Dual Link DVI that should work but I wanted to get things started today.

What can I do to get HDMI signal from MoBo?

Thanks.