Help Guys... G20 switching gpu back to Nvidia, but missing in device manager [solved]

[tyleryhy]

So I bought a G20 desktop three years ago, and since then I've always had my HDMI cord plugged into the Asus graphic card port. Recently I suddenlly lost signal form the port, so I had to switch to the other normal hdmi port. Now when I check my graphics card, it says that I have intel hd graphics 4600. I want to switch back to using the gtx gpu but its hdmi port has no signal. What can possibly be the problem here? Pls help thx