MacBook Pro :: How To Detect External Monitor Via HDMI

Jun 29, 2014

This is my first Mac. I cannot get it to detect my external display:  It is an ASUS PA248Q, manufactured Aug 2012.

The HDMI cable according to my Amazon history is at least 1.3c from 2010,  "Fanatic Digital Imperial Series Gold-Plated HDMI Cable (6 feet)". It works with perfectly connecting an AmazonTV box to an old Samsung TV, with vivid clarity, unlike our cableTV signal.

Just in case, I have a new HDMI cable on order, which claims to be of newest standards. The Macbook Pro Retina (late 2013) has the standard Intel Iris from the Haswell chips, as well as Nvidia GT 750M, the latter which I don't think has been used yet.

The ASUS display says:  HDMI NO SIGNAL. 

I have tried shutting them down and replugging the cable.  I don't know what the ideal order is.  The Macbook Pro is plugged into AC power, as suggested.

In System Preferences>Display, I press the Option key to select "Detect Displays" option (seriously unintuitive). 

I have also tried resetting the NVRAM:

I shut the machine down.  Pressed the power button, then quickly held the quadruplet:  Option-Command-P-R  (a double handful) and waited for the machine to chime a 2nd time.  Tried to detect external display no luck. 

Next, I reset the SMC:

I shut the machine down.  Then I pressed Shift-Control-Option-Power   for about 5 to 10s.  Then I turned on the machine normally. NVRAM & SMC steps were from an old youtube video, as the instructions I had did not explain how to do so clearly.

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