Reading but DVD is not spinning in portable dvd player

Some suggestions

assuming you know you're using good discs, and have this problem with more then 1 disc. In anything that requires you to open the player and play around in it, I also assume you're not too akward with electronics, and out of warranty:

spindle motor problems - you could either fix that by changing the motor, or occasionaly by dropping a little bit of 3 in 1 oil on the shaft.

Just dont start it as a hobby if you can still go complain at the store...

Good luck

i would say the IC that controls the motor gone bad, if you cant replace it, just bring it back to store.