HDMI not recognized

I'm struggling with my HP ENVY 15-j059nr Quad Edition Notebook PC .... I've been a fan of HP and Windows for many years. I am running Win 8.1 and just moved everything from my old Pavilion Entertainment PC. I spent HOURS last night downloading all the suggested driver updates.
There seems to be nothing I can do to get my HDMI connection recognized. Yes, it works perfectly fine with Windows 7 and my old laptop. I have at least twice seen an extension of my desktop for a brief moment but then 'no signal' displayed on my LP TV.
I'm at a lost for what to try next. Please send guidance.
This question was solved.
View Solution.

hhmmm - ok, this is puzzling...
Perhaps it's something with the resolution settings?  Here are the steps I found in the online user guide: on page 25.
1. Connect one end of the HDMI cable to the HDMI port on the computer.
2. Connect the other end of the cable to the high-definition TV or monitor.
3. Press F4 to alternate the computer screen image between 4 display states:
● PC screen only: View the screen image on the computer only.
● Duplicate: View the screen image simultaneously on both the computer and external
device.
● Extend: View the screen image extended across both the computer and external device.
● Second screen only: View the screen image on the external device only.
Each time you press F4, the display state changes.
NOTE: Adjust the screen resolution of the external device, especially if you choose the
“Extend” option. From the Start screen, type c, and then select Control Panel from the list of
applications. Select Appearance and Personalization. Under Display, select Adjust screen
resolution for best results.
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