Why does the Apple phone display a music symbol and cannot be turned on?

You have entered recovery mode (DFU). Usually there is a data cable below. You can try the following solutions:

1. Start iTunes and connect the iPhone to Connect to the computer, then turn off the iPhone.

2. Press and hold the power button until the Apple logo appears.

3. Press and hold the power button and the home button until the Apple logo disappears.

4. Release the power button at this time until the computer appears in DFU mode connection.

5. When a recovery prompt appears in iTunes (error correction), hold down shift and select the corresponding firmware to restore.