Lost sound on my computer

HP Pavilion a6554f. Windows Vista Home version. After you run a disk cleanup, defragmentation and removing "old" restoration programs, I have no sound. The speakers are built into my monitor and I use no external plug-ins (e.g. headphones). I have checked and confirmed that all the cables between my monitor and the computer are connected. The speaker icon (bottom right) is turned on and activated (speakers not on mute). I ran the test of sound diagnosis and speakers left and right don't make no sound. What else can I do to find and solve my problem? Thank you.

PS I apologize if my first post is deficient. I ran the tutorial post videos but, obviously, I couldn't hear anything that was said.

Solved my problem. My grandson had turned off the volume directly on the monitor. No further assistance needed at this time

Tags: HP Desktops

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