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Monitor blinking on and off until Windows starts up?

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I have no idea how to word this short enough for a title but for the last week or more, whenever I start up my computer, my monitor turns on like normal and then goes to sleep and then starts up and then goes to sleep about 30 times all in 1 second-ish intervals. It does this for a good 5 minutes or more until finally my windows log in screen comes up and I don't have any problems at all after that until the next day when I turn my pc on again.
I recently reinstalled my graphics card and someone told me that maybe my computer isn't recognizing my graphics card until windows start up ??
Here is a short video of this happening since I'm not sure how to explain it well:

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