Sound does not work on your system. Prior to turning system on it was working. What have you done to cause this and how can you correct it?
You checked to see if you disconnected any wiring and used a sound button to raise and lower sound on your monitor.
You can view and go through some steps in a missing or lost sound in Windows article. You can also perform a Windows system restore, if those steps don’t resolve your issue. Basically, you pick a restore point before your sound problem.
1. Log on to Windows as an Administrator.
2. Click Start, point to All Programs, point to Accessories, point to System Tools, and then click System Restore. System Restore starts.
3. On the Welcome to System Restore page, click Restore my computer to an earlier time (if it is not already selected), and then click Next.
4. On the Select a Restore Point page, click the most recent system restore point in the On this list, click a restore point list, and then click Next.
Note A System Restore message may appear that lists configuration changes that System Restore will make. Click OK.
5. On the Confirm Restore Point Selection page, click Next. System Restore restores the previous Windows XP configuration, and then restarts the computer.
6. Log on to the computer as Administrator. The System Restore Restoration Complete page is displayed.
7. Click OK.
Hopefully, this will fix your sound problem. These instructions were written for a computer running Windows XP.
