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When you try ctrl & F11 on your keyboard, release both together, or it doesn't work properly.
I forgot to mention, remove any peripheral connections you may have before doing this.
If you'd like to check what I'm instructing you to do and just go ahead and do it yourself, the step-by-step instructions from Dell, can be found here.
http://support.dell.com/support/topi...71438DA0E20ADD