The following command will completely shut down your computer in Windows:[br]
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Right click Start icon and select Command Prompt[br]
Type or copy/paste the following in that window:[br]
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C:\Windows\System32\shutdown.exe /s /t 0[br]
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After your computer has shut off, restart it again and then try testing shutting down as normal. If computer still won't shut down, please post what operating system the computer uses and your method for shutting the computer down.[br]