HDMI problems

[CameronThink]

So my HP computer tower has a PNY GEFORCE GTX 750 graphics card, it use to work just fine but now whenever I turn on my computer the HDMI doesn't work (We have an adapter because the card is weird and doesn't have the usual HDMI port). So I've tried using the VGA on it (Again an adapter for the graphics card), and the separate VGA plug in that's part of the computer also doesn't work. I dont know how to fix it if I cant see the screen.

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