My Hitachi DAP-780 Personal CD player does not read the music cd's. It says 'No CD'. I have cleaned the Laser lens.

SOURCE: music format

It's .wav format. However if you burn your MP3s as an audio disc (not an MP3 disc) with a program like Nero or Roxio Easy DVD Suite, then it will automatically convert them to .wav and burn them to CD and it will work with your CD player straight off.

SOURCE: CD Player not playing any audio CDs

The laser is damaged or dirty. Try gently swabbing the lens with rubbing alcohol and drying with canned air. If this fails the laser is damaged and unrepairable.

SOURCE: CD player not turning

The laser is damaged/worn out. It would be cheaper to purchase a whole new unit, instead of repairing that one.

SOURCE: Magnavox Jogproof Personal CD Player - says HOLD

there is a switch that locks all controls

SOURCE: Hi. I have owned my Durabrand Personal CD Player

Most likely the trouble is that the laser has just worn out and can't read discs any longer. The power drops with age and use, and sooner or later this happens to any CD player. The low cost of these personal CD players makes them uneconomical to repair.