No sound & No Volume Control in tray
Some time accidentally crazy things happen, alike master, wave, player volume muted. No power supply to speakers, Faulty speakers, lose contact in 3.5mm jack, plugged with wrong color etc.. or by time everything may happen together. Check everything is good
If Speaker connections, powered are made good and no sound. then this may be your problem. Actual cause of this bug is unpredictable.
Step 0: Check the rest !
It may seems to be silly, but worthy if your suffering by time.
Check speaker's audio jack is properly plugged in green port
Step 1: Check your Sound audio Devices property
Click Start>Control Panel>Sound audio Devices property
if every thing fine and you are able to mute or change volume, skip proceeding further.
if you find like this then you are right place.
Step 2: Check your audio drivers
If you see this message while accessing Volume control.(Start>All programs>Accessories>Entertainment>Volume Control) then check your audio drive whether correct software is installed and its health .
Start 3: Check Device Manager
Click Start>Right on My computer>Manage
Then you will see window named as Computer management.In that select device manager.expand sound, video and game controllers if you find audio drive software alike Realtek High Definition Audio, then audio drives healthy
Step 4: Audio Drives Missing
In some cases software is installed but not appears in device manager. this may happen due to avoiding system restart after installation or wrong software. Before installing new audio drive uninstall the old one, restart PC. Then install new one.
Step 5: Still No sound
Download Wise registry 8 or latest cleaner and do registry cleaner, system tuneup, Registry Defrag. Don't postpone a restart if system need.