after upgrade from window vista to window 7 suddenly my PC sound speaker not working and no sound i try to do something problem still no changing until now,please help me to get the solution.thank.my laptop model DELL INSPRIRON 1420.
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This will take you to your computer's drivers... http://support.dell.com/ The choices should be obvious for your computer.
Gandalf is correct -- you should check the drivers you have installed. When you go into Device Manager, what do you see under audio devices?