Hi Metallicats33, Kurtis,
I got exactly same issue. Disc Not spin but the player is able to identify LD or CD. Lucky, I have some spare parts ( both motor and power board ), and I swap the motor/power board one by one.Eventually, the broken component indeed is power board. In my case, all the ic protector ( eg, ICP-N10,N15,N50 ) are all fine in the broken power board but yes, it is just Not able to spin the disc for some reasons.
After I replaced it the good power board, the machine works like a charm.