Welcome to the forum Larry,
The first docs outline the procedure for Windows 7 or Windows 8; the last one tells you what to look for if things do not work as expected.
HP Notebook PCs - Connecting a Monitor, Projector or TV (Windows 8)
HP Notebook PCs - Connecting a Monitor, Projector or TV (Windows 7)
HP Notebook PCs - Resolving HDMI Display and Sound Issues
Order of Events is Critical - If it fails, then Start Again:
- Shut down the computer. Disconnect relevant cables.
- Turn off the monitor or TV.
- Connect an HDMI cable to the computer and to the display.
- Turn on the display, and select the HDMI input as the input source to view.
- Boot the computer and log in.
NOTE: Many TVs are not set to HDMI and have to be switched to HDMI on the TV side beforehand. Check!
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Good Luck!