Delstar DS 917 Digital Media Player "birthday message daughter" Questions

...birthday in June. She has been pleased with it until recently. The volume no longer works. Plus when the player is turned on and you select music, there is a Disk Error message. It was working fine a ...

...message that reads ''Press key ON'' but we can't figure out what that means. The keys on one side are the play/stop button, then volume+ and volume -. The other side has a hold key and a mode button ...