My macbook is not responding to the prompt to shut down

using the Recovery HD...it prompts me: "holding down the Command key and the R key until you see the Apple logo"...but nothing happens...HELP PLEASE!

What are you trying to do? If you are booted from the Recovery HD you shutdown by selecting that option from the menubar's Apple menu.
If you are trying to boot from the Recovery HD:
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.

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