No Sound when Portable music player is connected to my Windows 7 System

I have Windows 7 in my System. Whenever I connect music player to Windows 7 System, I cannot hear sound from the System. What might be the problem? Please, can anyone help me in solving the problem.

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Initially when you connect external music player, sometimes your System’s sound may set toi Mute. You need to enable the sound.
Follow these simple steps:

STEP 1: Click Start >> Control panel.
STEP 2: Click “Hardware and Sound”.
STEP 3: Click “Sound”.
STEP 4: Tap on the Playback” Tab.
STEP 5: Click “Speakers” >> Properties.
STEP 6: Tap on the “Levels” Tab.
STEP 7: Click on the “Mute” Button under “Line-in” to unmute or enable sound .