Open your registry and find the key and value below.

Change the value of 'APMMenuSuspend' to equal '00', restart the machine and the suspend option should have disappeared.

Key:[HKEY_LOCAL_MACHINE\Enum\Root\*PNP0C05\0000] 

Value Name: APMMenuSuspend Data Type: REG_BINARY Data: (00 = not visible, 01 = visible)

 

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