GT70-2OD HDMI/miniDP without discrete GPU

Hey guys I'm having a problem with HDMI output here. Please help.

Months ago, I fried my nvidia discrete GPU inside my GT70-2OD so I went ahead and removed it. Flashed unlocked BIOS, set primary graphics to IGFX. Everything worked fine without the card.
But yesterday when I tried to hook up an external monitor via HDMI output, I got no signal from it, nor did windows recognize the monitor.
I did some googling and found that HDMIs on GT70s are directly routed to the discrete card.
And I tried playing with BIOS graphics settings including setting the boot graphics to EFP, EFP2, EFP3 with no luck.

Does that mean I can't use the HDMI on my GT70 without a discrete graphics card?

Thanks!

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GT70-2OD HDMI/miniDP without discrete GPU