Do you have a card in the player? If so, remove it. Never add or remove a card when the player is on.
Will the player start up properly without a card in it? Do you have copies of the songs on the player also on your pc? If so, you could try formatting the player using your pc(format it as FAT32), which deletes all the songs on the player. With no songs on the player, my guess is that it will start up normally. If so, it rules out a hardware problem. With the player on, format it again using the player’s menu(settings, system settings, format). Imo the problem is probably a problem with the tags on your songs. Are your songs in mp3 format? If so, the tags need to be in ID3V2.3 ISO8859-1 format. Use a tag editing program such as mp3Tag, or itunes to edit the tags on your songs. Also remove the embedded album art. After you have edited the tags on the songs on your pc, copy them to the player.