Dropped imac now the screen is jerky

Somehow my iMac fell over face first onto my desk and cracked the display. It seemed to be working fine, I ordered a new screen and replaced it very easily. But now, a few weeks later, the display is starting to get jerky and will go black. I do not know anything about hardware etc... but does this sound like a video card issue? And if so, can that be replaced by me? It's a 2011. I'd like to try to fix it myself because changing the display was so easy and only cost me 70 bucks vs the 400 or so that Apple would have charged.

You may be lucky and it is just a cable or a socketed item that is loose, you will need to take it to pieces again and check all internal connections.
Hope you get it sorted out.

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