Is this system a laptop? If so, you may have a Function (FN) key combination to enable it... which on my Dell is a F2, which has a blue crescent moon on it. So, it would be the combination of pressing Fn+F2 together.
In addition, you may try to enable it using the command line, by executing the following in a command prompt or on the 'Run' dialog.
"rundll32 powrprof.dll,SetSuspendState"
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