The most common reason why the device won't turn on is lack of power. Try charging the battery to its full capacity and then attempt to turn the device on. If it fails to turn on after that, it could be a faulty battery (see guide for replacing battery).
Here are a few possibilities as to why you can't hear any sound through the earphones: 1. The volume setting could be too low: Try turning the volume up. 2. The audio file could be faulty/corrupted: Try a different audio file to see if it's a file problem. 3. The earphones might not be functioning properly: Try using a different set of earphones.
Here are some possibilities as to why the copy function won't work: There could be a bad connection to the computer, so try reestablishing that connection. There could be insufficient storage space, so try deleting some unneeded files. There could be a poor connection with the USB cable, so try reconnecting the USB cable. There could be a faulty USB cable, so try using a different cable.