That's because the Optical Pickup(the laser) has worn out of specification. When you insert the disc, the laser has to be able to read the TOC(table of contents) If it can't, it will think there is no disc in the unit, and fail to play it. You can confirm that the circuity is OK(for the most part) by trying a CD. I'm sure it will play that, as the laser has 2 parts,1 for CD and 1 for DVD.(the 2 discs use different wavelength light)
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