Fn+Power Button Hotkey to Toggle Powered USB without shutting down PC? -- Sager NP8278-S (Clevo P170SM-A)

I'm the proud new owner of a Sager NP8278-S (Clevo P170SM-A) purchased through XoticPC but shipped direct from Sager.

I haven't put it down since receiving it from UPS about 35 hours ago.

The manual mentions I can toggle the charging enabled status of the Powered USB 3.0 Port by using a Function Key + Power Button hotkey.

For me, this simply results in the computer powering off (as would be expected by pushing the power button).

How else can I enable / disable the powered USB port? I leave external portable hard drives (WD My Passport Ultra 2TB) plugged into all three USB 3.0 ports (I have them gaffer-taped to the back of the LCD) and want to make sure the one hooked up to the powered port isn't drawing power after I shut down my system.

Thanks!

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Sager NP8278-S (Clevo P170SM-A) from XoticPC
4th Generation Haswell Core™ i7-4810MQ (2.8GHz - 3.8GHz, 6MB)
NVIDIA® GeForce™ GTX 980M (8.0GB) GDDR5
32 GB DDR3 1600MHz RAM (4 x 8GB DIMM)
Windows 8.1 Professional
2 x 120GB Samsung 840 EVO Series mSATA SSD (Raid 0)
250 GB Samsung 840 EVO Series SATA SSD in Bay 2 (Scratch Disk)
1 TB WD Black 7200 RPM HDD in Bay 1 (Data Disk)
BD-R / DVD-RW

 

Perhaps this hotkey only works when powered off. My bad.