A quick revision using the Planck constant

http://i.imgur.com/hQdX1eg.jpg

Another idea - bringing back the Power On/Off imagery.  This one to me is quite simple yet intriguing.  The negative effect at the top draws your eye to the center of the logo.  While I like the HC with the extending 'coin line' through the C, I'm not sure I am sold on it.  Thoughts?

http://i.imgur.com/Nya6sxj.jpg