I upgraded a Sony Vaio all-in-one desktop, original windows 7 home premium, one terabyte hard drive with crucial MX500 500GB SSD. After install speaker icon at right lower side shows red X and no device installed in hardware. To correct issues do: 1. Device manager 2. Check system devices for High Definition Audio Controller, note if yellow triangle shows up 3 uninstall driver in above step 4 scan for hardware charges 5 install automatically Works! Immediately speaker shows normal without Red Cross, restart not needed.
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