New graphics card turns on but won't display?

I recently bought a ZOTAC GeForce GTX 970 graphics card to upgrade my computer, but when I tried to install it I had no luck. The fans spun but my monitor said "check video cable" and simply wouldn't display anything.

I ended up putting my old graphics card (the one my computer came with) back in to connect to my monitor again. At first I thought it might be the PSU, but I replaced it with a 500w one and still had the same issue. I also exchanged the graphics card for a new one thinking it might be faulty somehow, but this one doesn't work either, so I'm guessing that's not the case. Does anyone know what the issue might be?

Computer: Dell XPS 8700
PSU: EVGA 500w
Video Card: ZOTAC GeForce GTX 970

It might also be worth noting that I've never upgraded my PC before. I'm a little new to it, so please bear with me.

Thanks!
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  1. Does the monitor work for sure, and or the cables?
  2. Riffert said:
    Does the monitor work for sure, and or the cables?

    The monitor and cables all work fine with my old graphics card, a NVIDIA GeForce GT 720 (it came with the pc).
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