Having problems with your Dell OptiPlex 170L PC Desktop ?
I am unable to get sound nd also unable to change my screen resolution to 256 colours
\015 I am unable to get sound.\015
Check in the device manager, if the device is with the yellow question mark, uninstall the driver and reinstall the driver.
Repair Help & Product Troubleshooting for Dell OptiPlex 170L PC Desktop
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