HP Pavilion 15 Notebook PC hdmi port to hp monitor stopped working

I have a HP Pavilion 15 Notebook PC (processor: AMD A8-455m APU w/ Radeon HD Graphics) and for the past year been using it with an external HP 20wm monitor by way of HDMI to VGA cord. On March 1st 2015 I turned on my laptop and monitor and it could not find the external monitor. On the monitor it stated no connection found and monitor went to sleep. The cord and monitor work with my sons laptop so I know they're not the problem. Went to Screen Resolution and tried to detect and nothing. Having rolled back the driver (7600G) and no difference I updated it back again. I took the computer back to a restore point on Feb 26th and the outcome was the same it does not work.  I would appreciate any help that can be put forward so this issue can be resolved. 
Thanks,
Tom

Hi there @Aliikoma 
Welcome to the HP Support Forums! It is a great place to find the help you need, both from other users, HP experts and other support personnel.
I understand that you are having trouble with your connection to an external display. I am happy to help. Please post the full product number for your notebook. See the following, if you need help with that information.
How Do I Find My Model Number or Product Number?
You can try looking through these two pages and see if any of the suggestions make a difference for you.
Troubleshooting HDMI Display and Sound Issues
Connecting a Monitor, Projector or TV (Windows 8)
Let me know, whether you are getting any specific errors, or when using the methods in those pages if the HDMI shows up at all.
Malygris1
I work on behalf of HP
Please click Accept as Solution if you feel my post solved your issue, it will help others find the solution.
Click Kudos Thumbs Up on the right to say “Thanks” for helping!

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