Try holding down the power button for at least 30 seconds. After that, try holding down the center button while connecting to your pc. This will force an MSC connection. Make sure that the laptop is plugged in before connecting the player. If you can get the player to connect, then format the player via your pc, which will delete all songs on it. disconnect it, then format it again using the player’s menu.
It seems like you tags are probably messed up. Before loading songs on the player again, put them through a good tag editor and fix then. Sandisk players need ID3V2.3 ISO 8859-1 tags.
Oh, come on! Could you read what others are saying next time?! We all have held the freaking power button for like an hour together. Yes, it turns off. Yes we held the stupid center button while connecting to PC. It does nothing! Still same stupid flower. I have read about this issue, it’s always the same. Someone with issue states what happened, says that he tried connecting while holding the center button and that it does NOT work. First advice: hold the power button for xx seconds and connect to PC while holding down the center button. NO NO NO! It does not work. Same issue here…