But didn't you say the graphics card (video card) was UPGRADED?
You can look to see if there is an HDMI port on the back of your PC.
You can get a $40 PowerColor Radeon 5xxx card that has HDMI output if your PC does not have HDMI.
A year ago, I had never seen the inside of a PC in my life. Now I'm able to build a brand new HTPC from scratch.
It is very simple to upgrade or modify your PC if you need to. But you may not even need to at all, especially if it has a HDMI output.
I will give you a step-by-step instruction. No worries.
So step #1 is to look and see if it has an HDMI output.
You are not allowed to post anymore until you find that out.