There is no one answer but several possibilities discussed in several different threads. The possible issues range from dried lube to a split coupling on a motor shaft to intermittent contacts in the position sensor and a few others.. Search on "AG-1980 loading" and variation on that string read through them. Many include photos and video as well.
Parts wear and lube dries over time, so while not working two years ago is a good predictor of not working today, working 2 years ago is no assurance it will work today, especially with a 20+ year old VCR..
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