Computer not working, and keeps refreshing/restarting?

I got a new graphics card, and I plugged the new one in and turned my computer on, as it was turning on, I saw I didn't plug in the DP cable, so I plugged that in, and then I think my graphics card came undone a little, and since then, my computer isn't turning on. I think maybe since the graphics card... show more I got a new graphics card, and I plugged the new one in and turned my computer on, as it was turning on, I saw I didn't plug in the DP cable, so I plugged that in, and then I think my graphics card came undone a little, and since then, my computer isn't turning on. I think maybe since the graphics card pulled out a little while the computer was running, my motherboard might've been fried, but I'm not sure. Any thoughts?
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