Assuming you have a DVD disk, try a music CD. If it loads correctly, your movie disk is bad. If the music CD doesn't load either, the lens on the laser is dirty. I cleaned mine; however, it took a lot of disassembly. I wouldn't recommend it without serious consideration.
Comments
Assume you have tried different CD Disks . . . .
My Jensen {DVD Reader Style} unit has only had "loading issues" when I inserted Blu-Ray disks instead of the slightly older format DVD disk.
And I felt soooo dumb for having brought the Blu-Ray movies - - - -
TV: '17 Colorado V6 Z71 4x4, Tow Package, GM Brake Controller
Adventures: 54 Nights: 341 Towing Miles 43,780
https://tab-rv.vanillacommunity.com/discussion/9927/2019-jensen-jwm70a-dvd-cd-radio-loading-loading-loading#latest
ASA replaced ours even though out of warranty
2019 T@B400 Boondock Lite "Todd"
"Just Enough"
2013 CS-S us@gi
2015 Toyota Tacoma PreRunner Double Cab