The lens of promac dvd code number is khs 1313. Same as the lens of lexing dvd. The reason why your promac midi play wasn't able to read the dvd or mid disc format beacuse of the folling reason:
1. The lens is not khs 1313
2. The distance from the cd holder is too low or high. When the lens start reading the disc it moves up and down. The dvd or midi disc format is compressed that the vcd or cd format. Therefore the vcd or cd can easily be read while the dvd needs to have specific distance from the lens to the cd holder.
Recommendation: I suggest you to adjust the cd or dvd holder to low or high and meet the spicific distance.Balancing and stabilizing the lens. I swear, That your dvd player read 100 % accurately that if your lens that has been replaced is khs1313. By Loynie mark....